Tuesday, September 30, 2008

Hey Everyone! I'm Anthony Lee and I'll be your scribe today! There are two Anthony's in our class so please dont get me confused with the other one :). Since we didn't do much except correct questions 5-13 on the back of our booklet "WAVES IN TWO DIMENSIONS." So this will be short and sweet.

ANSWERS TO Q's 5-13 on WAVES IN TWO DIMENSIONS

5.

This diagram shows that when a water wave hits a barrier, the one with the bigger wavelength will diffract more. So to answer question 5 the answer is "Situation B" shows the greatest diffraction.

6. The ocean wave with a 200m wavelength

7.. THe D note (294 Hz) will be heard more clearly because the frequency is lower therefore having a bigger wavelength.

8. The orange light (610nm)

9.

a) Red light (700 nm)

b) Red light (700 nm)

10. 400m wave crests

11.

a) 10000Hz

b) 10000Hz

12.

a) The 2nd nodal to the left of prependicular bisector is the orange line

b) It is destructive interence at the point of the square

c) square is located on nodal line 4

d) (4.0)(6 wavelengths)= 24 cm

13.

a) (16 cm - 15 cm) = (1-1/2) ﮑ
1 cm = 1/2 ﮑ
2 cm = ﮑ

b) V = f ﮑ

= (4.0 Hz)(2 cm)

= 8 cm/s

*Reminder* For those who are having trouble with diffraction just remember that when wave length is wider the diffraction will be greater, and if frequency is lower the diffraction will be greater.

Well this is about all we did, except we were given a review but that will be corrected tomorrow so we can let the next scribe worry about it. AND THE PERSON I CHOOSE FOR NEXT SCRIBE IS ALEX SHARP! cya all in class tomorrow!

This is JUNNEL, not mark. :)

HELLO HELLO HELLO it's Junnel :) the one annnnd only, using Mr. Aquino's account due to some difficulties with my own .HAVE to scribe for today's class. It's okay though, we didn't really do much today anyways.

Firstly, we started off with watching the video that we watch every once in awhile. This time we continued off with learning about "Interference" for today's topic.

Secondly, Ms. Kozoriz gave us a worksheet that we did together in class.

ANSWERS (INTERFERENCE EXERCISES):
NUMERO UNO!

A) Draw the line showing the third nodal line to the left of the perpendicular bisector.

B) It is CONSTRUCTIVE

C) I didn't get this answer, but from what i heard it was either FIVE or TEN.

D) Determine the wavelength

PS1 = 12

PS2 = 9.0

PnS1 - PnS2 = (n-1/2)λ

(12cm)(9cm) = (2 - 1/2)λ

(3/2)(3cm) = (3/2)λ

6/3 = λ

ANSWER: 2cm

E) What is the frequency?

v= 5.0 cm/s

λ=2cm

f= v/λ = 5cm/s /2cm

f = 2.35hz

SECOND QUESTION!

A) What is the wavelength?

22cm - 17.5 cm = 1/2λ

(2/1)4.5cm = 1/2λ(2/1)

9cm = λ

B) What is the speed?

v = fλ

v =(6.5Hz)9cm

v = 58.5 cm/s

LAST QUESTION!

A) I don't know what happened to my picture, it wouldn't upload :(

B) It is DESTRUCTIVE

C) It is on the FOURTH LINE

D) What is the distance?

=6λ(2.2cm/1λ)

=13.2

That's all we pretty much did in class. I guess .. I shall see you guys in class. By the way next scribe is Mr. ANTHONY LY! MUHAHA just kidding :) yeah but your our scribe! DON'T FALL ASLEEP! :P

...

Guess who's the scribe for last friday..yes , you guessed right its me erica, yeayy!

First of all, remember the 4 questions we had for homework last Thursday on page 19 on the blue book? (Title: Waves in Two Dimensions Problems )
We corrected them and here are the answers:

... And also last Friday we watched a video called “Reflection and Refraction”. While watching the video, we were given a sheet, titled “ Physics 11 Waves in Two Dimensions Unit: Reflection and Refraction. Were asked to answer the following questions. The guuureeaat thing about last friday was that we didnt have homework: )

oOYeah, we also have a new student in our class, his name is Aldrin. WELCOME Aldrin ,have a great school year.

......Another thing is that we finished the pharagraph on the study guide booklet:

Diffraction and Interference of Waves

When waves reach a small opening in a barrier, they form circular waves that spread out from the opening. This spreading of waves is called Diffraction. The smaller the waveleght in comparison to the size of the barrie, the less the diffraction. When ther are two opening in a barrier, two sets of circular waves are produced. When the new waves interfere with each other, constructive interference produce large waves, and desctructive interference produces a line of nodes.

Thats pretty much all we did last friday, soo the next scribe will be...innnie minnie miney moe, i choose JUNNEL!, your very welcome, muauuaahhahaa!: )
-ericamaquimot

YAY ME! September 25,2008.

THANKS TO ARLYN FOR CHOOSING ME TO BE SCRIBE -_-". jk its ok.
Anywaaays, today in class.. we finished the "REFLECTION OF WAVES" and "REFRACTION OF WAVES" paragraphs from the study guide. For those who were absent from class, these are the answers..

REFLECTION OF WAVES:
The direction of waves moving in two or three dimensions is shown by RAY diagrams. The ray that reaches a barrier is called the INCIDENT ray. The ray that moves back from the barrier is called the REFLECTED ray. The direction of the barrier is shown by a line drawn at a(n) RIGHT ANGLE to the barrier. This line is called the NORMAL. The angle between the INCIDENT ray and the NORMAL is called the angle of incidence. The angle between the REFLECTED ray and the NORMAL is called the angle of reflection. The law of REFLECTION states that the angle of incidence equals the angle of reflection.

REFRACTION OF WAVES:
In water waves, the velocity is SLOWER in shallower water. If the incident ray is parallel to the normal, there is a change in the velocity and WAVELENGTH of the wave. If the incident ray is not parallel to the normal, there is a change in velocity, wavelength, and DIRECTION of the wave. The change in DIRECTION of a wave at the boundary between two media is called refraction.


We also corrected the REFRACTION sheet from yesterday.
1) 1.40
2) 1.24 x 10^8 m/s
3a) 41.4º
3b) 61.6º
4) 1.97 x 10^8 m/s
5a) the light ray should appear to be faster in the water rather than through the container.
5b) sin(theta)2 = 1.52 sin 27.7º
1.33

After correcting these papers, we were given time to finish our lab experiments and worksheets. We were also told to read pages 300-301 in the textbook, finish the last paragraph in the Study guide, and do questions number 1-4 at the end of the booklet.

The best part of today's class was the fire drill. Just kidding. Ummm, If i could choose Mrs. Kozoriz to be tmrw's scribe, i definately would, but i don't think that's allowed.. soooo i pick Erica!

Wednesday, September 24, 2008

Hi guys! This is arlyn (pronounced: arleen) and i am the scribe of the day. In class we performed an experiment on the bending of light. Incase you weren't in class today i'll explain what you need to do so you can do it in the comforts of your home.

Materials needed to perform this experiment are; a sheet of graph paper, a ruler, marker, water, and a transparent half circle container.

Procedures
1. First you need to draw a horizontal line across the middle of the sheet of graph paper. With a marker draw a verticle line in the centre of the flat and curved side of the semi-cicle container.
2. On the line previously drawn trace the container, marking where the line you drew the container is. Fill the container with around a half or three forths of water and place it in the semi-circle outlined on the sheet.
3. Lets call the flat side of the container side a and the the curved part side b. At eye level with the container on the paper, look through b and align the ruler with the line of side a. Repeat this step five times at different angles
4. Repeat step three but look through side a and align the ruler with side b.

I don't have the lab questions with me right now so i think you should get one as soon as possible. Hopefully my instructions were clear enough for you guys to understand. k bye! =D

I would have picked Mark to be the scribe again but i don't think it's allowed.. so i choose Dearly ! Bwahahaha :P

Tuesday, September 23, 2008

Hey everyone! It's me, Allison, taking Arlyn's place of scribing for today.We started class off by going over Snell's Law for Water Waves, which can be found on page 12 of our Waves in Two Dimensions booklet. After that, we completed the 3rd page of the Guideline to Drawing Problems booklet. In case you missed it, here are the answers:

a) n = Vd / Vs = 40cm/s / 30cm/s = 1.3

b) λdeep = Vdeep / F = 40cm/s / 10.0 Hz = 4cm
λshallow = Vshallow / F = 30 cm/s / 10 Hz = 3cm

c) There are there possible ways to answer this question.

The first way is:
Vd / Vs = sinθi / sinθr
sinθr = (sinθi)(Vs) / Vd
= (sin30°)(30.0cm/s) / (40.0cm/s)
= (0.5)(30) / 40
sinθ = 0.375
θ = 22°

Another way is:
λd / λs = sinθi / sinθr
sinθr = (sinθi)(λs) / λd
= (sin30°)(3cm) / 4cm
= 0.5(3) / 4
sinθr = 0.375
θr = 22°

And the final way:
n = sinθi / sinθr
sinθr = sin30° / 1.3
θr = 22°

Once we finished that, we were assigned two sheets, both labelled Refraction. I'm guessing they are due tomorrow? If not, then Thursday for sure. We were also given a green sheet which had the index of refraction for different substances as a reference.

Yeah, that was pretty much it. Hmn, the scribe for tomorrows class will be Arlyn Guevarra. I'll see all of you guys in class, haha. Later gater! :) - Allison

Waves in 2 D

Hey guys! This is Mark and I am the scribe for today. Today in class, Ms.Kozoriz gave us our "Waves in One Dimension test" back and she corrected the test with us. Here are the answer to the test if any of you guys missed out on it.

1.

2. Amplitude = 1.5cm
wavelength = 4.5cm

3. Transverse wave

4. Longitudinal Wave

5. Compression, Rest Point, Rarefaction, Amplitude, Compression

6. F=λ/T = 10/0.5s = 20Hz

7. 120s/80 = 1.5s

8.

9. F=λ/T = 240/0.30m/s = 800Hz

10. λ=Z/F = 340ms/510Hz = 0.67m

11. 1)B
2)C
3)C
4)A
5)A

12. a)Destructive
b)Constructive
c)Constructive
d)Destructive

13. A standing wave is a result in of two wave trains of the same wavelength, amplitude traveling an opposite direction through the same medium.
No it doesn't stand still

14.


15.

16.




We also watched a video about "waves in two dimensions" which helped us with our previous assignment "waves in two dimensions - assignment 1" we pretty much did a review on what we did last Friday, and if you look at Lorenz's previews post, it explains what we reviewed in class.

OKAY, THAT'S ALL FOR NOW

Next Scribe: Arlyn Guevarra

Note for Ms.Kozoriz
Junnel needs to talk to you

Friday, September 19 , 2008

hi guys...it's me Lorenz....so now you all know that I'm doing the scribe for last Friday.

So, what we did on Friday is we went over the A.Two-Dimensional Waves and the Ripple Tank, B.Wavefronts and Wave Rays, C.Reflection from a Straight Barrier: Wavefronts, D.Reflection from a Straight Barrier: Wave Rays and a little bit of section E.Reflection of Circular Waves from a Straight Barrier from the blue booklet: Two Dimensional Waves.

Wavefront - is a continuous crest and trough.
Wave Ray - is an arrow at right angles to the wavefront.

We also did the Exercises sheet. Here are some examples that we went over through.




Wavefronts are always perpendicular to the waveray.



This an example of a Reflection from a Straight Barrier.



<--Incident waves
Reflected waves-->
The incident waves approaches a straight barrier and then reflected back along its original path.

Angle of Incidence = Angle of Reflection
Angle of Incidence for the wavefront is the angle between the incident wavefront and the barrier.
Angle of Reflection for the wavefront is the angle between the reflected wavefront and the barrier.
Angle of Incidence for the wave ray is the angle between the normal and the incident wave ray.
Angle of Reflection for the wave ray is the angle between the normal and the reflected wave ray.
Normal is the straight line that is perpendicular to the barrier.


Before the end of the class, she gave us the sheet Waves in Two Dimension - Assignment 1 that needs to be hand in on Tuesday, September 23.


I apologize for the late post guys and hopefully i gave you enough information to understand the topic. The next scribe will be mark aquino. So yea, see you all in class and take care.=)

Thursday Sept.18/08

Hi hi! This is Ryan and I will be the scribe for today =). Today in class we started off with our Waves in 1Dimensions Test. Then after the test Ms.Kozoriz handed us our old homework from previous classes.

They were:

• The Job Description (Why is Physics used in this Career)


• Concept-Development Practice Page 25-3 (Wave Superposition)

The next thing that Ms.Kozoriz handed to us was a new booklet entitled "Waves in Two Dimensions," and also an Excercises sheet. We must read pages 3-4 in the booklet. And after she handed that to us she explained that "Wave fronts are always perpendicular to wave rays." And here is a picture I made on paint that she drew on the board. =).

• The Red Square shows that it is perpendicular
• The Grey Dashed Arrow is the Wave Ray
• The Black Lines are the Wave Fronts
• The space inside the Wave Fronts is the Wavelength or Lambda

And that was pretty much it that we did in class. Ahahaha I thought scribing would be harder but it isn't =/ ahaha. Well anyways that is it. OH and I forgot that you need to be bring:

• Protractors
• Rulers

Because we would be making lots of pictures and such. So I will end my scribe here, and next scribe knows who they are so yeah. See you all in class. XD

September 17, 2008

Hello everybody! This is Lynel, and I am today's scribe. Today in class we corrected the the sheets we were given for homework last night. Here are the answers to the worksheets just in case any of you have missed them...

Wave Characteristics

1. a) 330/20000= 0.165m

    b) 330/20= 16.5m

2. λ= 2.9m

3. F= 9.2x10^5 Hz

4. V= (6m)(2Hz)

      = 12m/s

5. a) T= 8s

    b) F= 0.125 Hz 

    c) λ= 16 cm 

    d) V= 2 cm/s

Wave Problems #7-14

Most of these problems invlove drawing so i'll show you where they may be found in the blue booklet.

7. a-d) refer to page 7 in blue booklet

8. a-b) it can also be found on page 7

        c) frequency

d) amplitude

9. Standing waves aren't produced in swimming pools where there are many people present because standing waves require the same wave lengths, amplitude, and frequency.

10. refer to page 7 (G. Wave Interference and the Principle of Superposition)

11. F= 4Hz

      d= 0.3m

      λ= 2(0.3m)

= 6m

     V= Fλ

=(4Hz)(0.6m)

=2.4m/s

12. V= 350m/s

       F= 420Hz

       λ= V/F

 = 350/420

 = 0.83m

The node is 0.83/2 which equals 0.42

  14. a) 3 wavelengths

b) 21 cm

c) 10.5 cm

d) 21m/s

We were also given class time to do the Transparency Worksheet that was handed to us. On this worksheet we learned the properties of two waves, transverse wave and longitudinal waves (compressional). Remember to study for tomorrows test!! Hope everyone does well!!! Tomorrows scribe will be Ryan Rara=) 

September 16, 2008 - Tuesday

So hello guys=] It's caaamy (Camy.. in case) and I am your scribe for today, thanks to Yvanne=[. Hah, I'm pretty clueless as to how to use blogger and all, so humor me please.

Today in class, Ms. Kozoriz started off by explaining the two types of wave interference:
Constructive Interference and
Destructive Interference

In case you weren't there or weren't really paying attention, I'll recap for you what you should have picked up from today's lesson.

First of all, wave interference - occurs when two or more waves act simultaneously on the same particles of a medium, resulting in a new displacement.

Constructive Wave Interference

This first type of wave interference occurs when two waves interfere with each other to produce a resultant displacement greater than the displacement that would be caused by either wave.
You can remember this because its title is logical to its concept - construct as in to build, so this is the type of interference that results in a higher amplitude, made up by the two pulses directly on top of each other.

In order to determine the new displacement of the particles, the Principle of Superposition is used. This principle states that the resultant displacement of a given particle is equal to the sum of the displacements that would have been produced by each wave independently. The two pulses can either be a crest and a crest, or a trough and a trough in order for constructive wave interference to happen.
In the example below, let's say that each pulse has an amplitude of 1 cm. As the two pulses approach each other, at the time interval of 1 second, they interfere and are directly on top of each other resulting in the maximum amplitude of 2 cm (the sum of the two waves).

Remember that these two pulses cannot be opposite as in, a crest interacting with a trough, vice versa. That, would result in a different type of wave interference. And you bet that this would be...

Destructive Wave Interference

This type of wave interference occurs when the resultant displacement is smaller (destruction!) than the displacement caused by one wave independently.

The diagram below is much like the one we drew in class today as an example of destructive wave interference. So using it (pulse A is the left pulse, pulse B is the right pulse), the two pulses are approaching each other. They both have an amplitude of 2 cm. At the third time interval, the two pulses are interfering with each other. Because these two pulses are equal in amplitude but opposite to each other, they cancel each other's displacement. This results a displacement of zero, causing the horizontal line that you see.

If you can't get anything out of my explanations then you can check out these sites for further clarification:
Constructive Interference - http://id.mind.net/~zona/mstm/physics/waves/interference/constructiveInterference/InterferenceExplanation2.html
Destructive Interference -
http://id.mind.net/~zona/mstm/physics/waves/interference/destructiveInterference/InterferenceExplanation3.html
annd hey! Ms. K mentioned this site and it's pretty informative, you should also check it out:
http://www.walter-fendt.de/ph14e/


After our little lesson of today, we were to move on to correcting last night's supposed homework, questions 7-14 from the blue booklet (Grade 11 Physics - Waves in One Dimension). However when Ms. K brought it up and checked to see who finished it, a much less than adequate amount of people completed it.=O. She then gave us the rest of class to work on that, along with the two worksheets, which we must all hand in tomorrow. I should put some emphasis on that.

Homework!!!
- Questions 7-14 from the blue booklet
- The two worksheets to hand in for tomorrow entitled Wave Characteristics and Wave Superposition.
- Study for the Waves in One Dimension Test that will be on Thursday, September the 18th!


Okay, that is all for today's scribe post! I'm sorry if it seems rushed (that's only because it was rushed) AND that it's quite late due to work, but I tried my beeest! And hey, look forward to tomorrow's scribe post which will be done by none other thaaan...
Lynel Pobre! - lynel (you're very welcome).

See yaahh everyone=]]

Monday, Sept 15 2008

First of all, I am very sorry I just started the blog right now. I just came home from a dance rehersal, I apologize. (: But hey! I'm still in front of my pc doing this awesome blog of mine!

--

Today in class we basically went over the study guide given to us on last friday.

It mostly covered the properties of the waves and the wave interferences.

What I will be doing is picking out certain parts under every subtopic that I believe is the most important out of the whole study guide.

WAVE PROPERTIES

Types Of Waves:

Mechanical waves: require a material medium (basically means it is not capable of transmitting

energy through a vacuum/empty space)

: examples - water waves and sound waves

: 3 kinds of mechanical waves - transverse, longitudinal, and surface waves.

electromagnetic waves: requires no medium

: examples - light waves and radio waves
: produced by the vibrations of charged particles

**refer to past posts by past scribes for further detail on transver, longitudinal and surface waves. **

Refresher on measures of a wave:

frequency: number of complete vibrations per second measured at a fixed location (hertz)

period: shortest time interval in which the motion repeats itself

wavelength: shortest distance between points where the wave pattern repeats itself (lambda)

Amplitude Of a Wave:

- it takes more work to produce a wave with a large amplitude than it does to produce a wave with a small amplitude.

therefore: the larger the amplitude, the more energy is transferred.

WAVE INTERFERENCE:

Waves at Boundaries Between Media:

(media is plural for medium)

this subtopic basically covers what happens to waves when we have more than one medium.

**the speed of a mechanical wave does not depend on the amplitude or the frequency of the wave**

Mrs. Kozoriz said that this is a very important thing we need to know so get it stuck in your head!

**the speed of a mechanical wave does not depend on the amplitude or the frequency of the wave**

Got it yet? Let's just have it one more time.

**the speed of a mechanical wave does NOT depend on the amplitude or the frequency of the wave**

Having that said, the speed of a mechanical wave only depends on the properties of the medium.

incident wave: the wave that reaches the bounday between one medium and another.

transmitted wave: the wave that moves through the new medium

reflected wave: the partial wave of the incident wave that moves backward from the boundary

**when a wave passes from a less dense to a more dense medium, the reflected wave is inverted. **
** when a wave passes from a more dense to a less dense medium, the reflected wave is erect, or on the same side.

!CONSIDER THE FOLLOWING!

When a wave is trasnmitted from one medium to another, the frequency of the wave does not change, however the wavelengthe and the speed of the wave changes.

Superposition of Waves:

PRINCIPLE OF SUPERPOSITION: the displacement of a medium caused by two or more waves is the algebraic sum of the displacements caused by the individual waves.

*interference is the result of the suporposition of two or more waves*

*constructive interference occurs when the wave displacements are in the smae direction.

*destructive interference occuse when the wave displacements are in opposite directions.

Standing Waves:

Node - area that is undisturbed (moves the littlest)

antinode - area with maximum displacement

--

I think that this is a very interesting topic actually. It's my first time to ever study Physics and I'm actually quite interested in this topic. I just find that it has a looot of information you really need to know, like the parts of the waves, what everything does and how it affects other things. Once you really get to understand everything we cover in class, I think the test will be a alright for us all.!

So that's the end of all of this Physics talk.

AAANNNNDDD! not to forget that we have a very lovely Physics Test dedicated to Waves in One Dimension on Thursday, September 18 2008. So study study study!

The scribe for tomorrow will be CAMY TRAN! (caaamy)

ciiiiiaaaaaoo!!

-yvanne gelli dandan (:

This Isn't A Boring Title.. Not At All

Hello friends, this is Nelsa blogging again (because stupid blogger ERASED EVERYTHING I JUST FINISHED TYPING UP, UGH). .. I'm not mad, no of course not.

So anyways, we went over those three sheets that Ms. Kozoriz gave us how many days ago. I'm not going to bother writing up every single answer because that'd take up a whole bunch of time (again!).

We also corrected the six questions the sub assigned when Ms. K was away. Here are the answers:
1. both - the transverse wave is represented by the vertical component which is made when the dominoes are still standing; the longitudinal wave is represented by the horizontal component created when the dominoes fall
2. .1 cycles/sec - the first wave does not count, there are only ten cycles
3. 520 m
4. 1.7 x10^-5 sec
5. a) 8mm - 'up and down' distance means from crest to crest through a trough
b) 2500 Hz
c).0004 sec ; 125000 cycles
e) 50
6. slower


We were given a 'study guide' at the end of the class, but since we only got five minutes to work on it last class, I'm pretty sure we're going to be working on it on Monday, which is tomorrow.

Okay, that's it. See you all Monday. Oh, yes, and the next scribe shall be Yvanne, cool.

September 11/08

HEY!!!!!!! It's my turn to scribe today!!! Woo!!! Alright, down to business. Today in class we had the sub who told us to do those questions 1-6 on page 12. I should probably get my sheet so i can write down helpful tips on the blog here. Alright, so, most of the questions involve the motion of waves.

Question 2, you're solving for frequency so its as simple as counting the number of waves and time and plug it into the equation frequency=cycles/second.

Question 3, convert 580 khz into 580000 Hz and divide into the speed of light. The seconds will cancel out leaving you with the answer in meters which is what wavelenght is measured in so presto! you're done that question!

Question 4, convert 2.5 cm into meters. Then substitute into velocity=(frequency)(lambda) solve for frequency since you know wavelength and speed. Then convert your frequency into period by righting out frequency as cycles/second and then inverting it to seconds/cycle.

Question 5, There's a alot of parts to this one, so hang on!

a) It's as simple as multiplying the amplitude of r the wave by 2.

b) Quite simple again, solve for velocity, velocity=(frequency)(lambda), fill lambda and the wave speed and jus solve for frequency

c) Using the frequency from the last question, simply just invert the frequenc from cycles/second to seconds/cycle to get the period

d) This one is a little bit tricky, to start, you need to cross multiply to see how long it takes for the wave to 1km, to do this convert 1km into 1000m, then cross multiply and solve for seconds in the equation of 450m/1sec = 1000m/ ???sec, then using frequency from 2 questions ago, (frequency is cycles per second) multiply your answer for seconds by the frequency and you should be left with an answer with the unit of cycles.

e) And we have already solved this question in the question above.

Question 6, The wave would be slower because if you see on page 7 of the blue booklet, as the pulse hits the higer density medium of the second spring it slows down.

And that is all we did in class on this day of September the 11th, 2008 a.d.

My mother told me to pick the very best scribe and you, are, IT! Nelsa :):)

Live long and prosper everyone!!!!!! :):)

September 10, 2008

Hi everyone. Today in class we performed an experiment using "snakeys" also known as slinkies. We followed instructions from the green text book and answered questions on a white sheet. In the experiment we discovered that transverse and longitudinal waves have the same charachteristics. When one person pushes the slinky to the right and another person pushes the slinky to the left then you can see the waves passing through each other.

The next scribe is going to be Dion.

September 9, 2008

Archimedes here, replacing Dion as our first scribe after agreeing that he allow me to be the first scribe of our class in exchange for appointing a classmate of his choice to be the next scribe. In case you are wondering who I am, I'm a Greek physicist, mathematician and astronomer. Well, I was at least... or I'm just Aldrin..

Today was a continuation of last Friday where we were ungracefully interrupted by a long, yet brief assembly. We were to obtain a blue "Grade 11 Physics Waves in One Dimension" booklet if we had not already acquired one on Friday. We read the first few pages of the booklet and later proceeded to going on our field or hall trip. We also received four sheets to complete, which are as follows:

Grade 11 Physics: Waves in One Dimension
Physics 11 Period & Frequency Problems
Concept-Development Practice Page: Vibrations and Waves 25-1
Characteristics of Waves: Physics 30S

Here is a general overview of what we discussed and did in class.

Archimedes’ Language Bank (Terms and Definitions)

Key Formulas
V= λ / T
V=f λ
F=1/T

Continuous (Periodic) Wave: a wave produced by a disturbance (oscillating or vibrating source) that is moving back and forth continuously
-Producing a back and forth motion while holding onto a slinky creates a continuous wave

Transverse Wave: a continuous occurrence of pulses where the particles are simply displaced up and down while traveling in a direction that is perpendicular to the pulse itself
-Waves traveling on a guitar

Crest: the highest point on a wave

Trough: the lowest point on a wave

Amplitude (A): the distance between a crest or trough and equilibrium lin

Equilibrium Line (Level): the undisturbed position or axis of zero

Cycle: one complete sine wave or complete up and down motion, which is also known as one complete oscillation

Wavelength (λ): horizontal length of one cycle of a wave, or in other words, the horizontal distance between any two successive equivalent points on the wave. In a longitudinal wave, it is the horizontal distance between the center of a rarefaction and center of one next to it

Frequency (f): number of complete cycles or crests that pass a given point per unit of time, commonly measured in cycles per second or hertz (Hz)

Period (T): the time elapsed between two successive crests passing by the same point in space where the standard unit of period is the second

Wave Velocity (V): velocity at which the wave moves

Longitudinal Wave: the vibration of particles of the medium traveling the same direction as the motion of the wave

Compressions: areas in a longitudinal wave that are momentarily close together

Rarefactions (Expansions): regions where the coils are momentarily far apart

I apologize for my lack of effort I put into this scribe post. You may find a lot of grammatical, capitalization, punctuation, and spelling errors, but whatever. I needed to rush because I had other things to do. Anyways, good luck to the next scribe, who is Rebecca and slinky thingy tomorrow I believe?

The Scribe List

This is The Scribe List. Every possible scribe in our class is listed here. This list will be updated every day. If you see someone's name crossed off on this list then you CANNOT choose them as the scribe for the next class.


This post can be quickly accessed from the [Links] list over there on the right hand sidebar. Check here before you choose a scribe for tomorrow's class when it is your turn to do so.

lynel

Katie N Mark A

Thoa Thoa caaamy deaarly

rawra=)