November 14 && 17, 2008

--------Friday, november 14,2008 -------
In physics class, we corrected the test on the supporting arguments of both particle and wave theories of light. It was out of 30 and it was calles Nature of Light II.... here are the corrections :

1. a.) Rectilinear Propagation: Light travels in straight lines, and its very fast.
example: a ball thrown quickly travels straight.
b.) Reflection: angle of reflection equals angle of refraction.
c.) Refraction: Light moves slower on a less dense medium.

2.a.) Rectilinear Propagation:


b.)Reflection: angle of reflection equals angle of refraction

c.) Refraction: light travels in a more dense medium


3.) State 2 properties of light that Newton couldn't explain very well with his particle model.

-Difraction -Partial reflection/ refraction

4.) (about your choosen scientists)

5.)


6.) (c.) wavelength of light
7.) (a.) electromagnetic wave
8.)

9.) Einstein stated that light was not transmitted as a continuous wave. He proposed light was transmitted as a photon and his famous experiment was the photoelectric effect.
10.) wave, then particle.

Alsoo on friday we took down notes :) ....
Kinematics
Scalars - number, unit
-distance
-temperature
- time
- speed
-mass
-energy
Vectors
- number, unit + direction
- position
- displacement
-velocity
- force
- weight
- acceleration

Time
Instantaneous time: clock reading
Time interval: difference between 2 clock readings

After taking down notes we were given a short worksheet and then we corrected it.
....that was all for friday.
-----Monday, November 17, 20008-----
Todays class we just did lab. Actually half of the class did lab and others, worked on worksheets that we were given. The lab was just to try and experience how the position time graph goes.
Ohh yeah..... in the end of the class were told to hand in the worksheet that were given for homework last friday. thats pretty much all we did :) kaaay see you all tomorrow!!

THE NEXT SCRIBE : yvanne dandan.

NOVEMBER 13, 2008.

In today's physics class, we had a short test on the supporting arguments of both particle and wave theories of light, a scientist who contributed to the current knowledge of light, and Young's experiment. The test was out of 30 marks.

Near the end of the period, we were given booklets entitled "kinematics", which is just a couple of pages long. I think i remember Mrs. Kozoriz saying that it was review from grade 10? I'm not sure. Buuuut, that's basically all we did this class.

See you guys tomorrow :]

PS. The next scribe is going to be.. Erica.

Nature of Light Part 2

Sorry, I forgot to blog yesterday...

So what we did yester day was just a review for the test today.

Topics:
Newton's Corpuscular Theory
Wave Theory of Light
Young's Experiment
The Photoelectric Effect
The Principle of Complementarity and Light

For the test you should be able to:
- know the supporting and counter arguments for the particle and wave theories of light:
Rectilinear Proopagation
Reflection
Refraction
Dispersion
Diffraction
Partial Reflection/Refraction
Speed of Light
-The Different Scientists that contributed to our current knowledge of light:
Galileo, Roemer, Huygens, Fizeau, Foucault, Michelson
-The Equation from Young's Experiment
Wavelenght = ((x)(d))/L
where: x- distance between two successive
d- distance between the two slits
L- distance between the slits and the screen

The Next blogger is Dearly:-)

November 10, 2008

Hello everyone !! Ramina is here...
ahmm,..
Today, Ms. K was absent but we had a substitute teacher. Also, today we just work on our assignment and do some work that we have from other class..

Hmm,, today I'm gonna post the venn diagram that we did last week because Kim forgot to post it, so here...

Differences and Similarities Of Particle and Wave Model




also, we have a new classmate and her name is Faye ( I think.. ) eheheh
ahmm,, that's all we did.. If Ms. K ask me to do the scribe on wed. I'm willing to do it but if not the next scribe is Anthony N..... *__*

*_* hi...

Today Ms. K discussed the photoelectric effect and the wave-particle duality.


The Photoelectric Effect

• refers to the emission of electrons from the surface of, generally a metal in response to incident light.
• particle theory and wave theories of light make different prediction about the effects of the frequency and the intensity of light.
• 1900 Einstein successfully solved this contradiction when he proposed the idea that light is made up of photons, that interacted with the electrons in the metal like discrete particle,rather than a continous wave.

The Photoelectric Effect and the photocell

• Photocell is a vacuum(gaseous pressure of absolute zero) tube with a concave tube called an emitter,made from a material that emits electron easily.
• photoelectric effect can be studied using a photocell...

Click the link below for better understanding...

http://www.usd.edu/phys/courses/phys431/notes/notes5g/photoelectric.html

The photoelectric effect and the wave theory

• threshold frequency is the minimum frequency of a photon that can eject an electron from a surface.
• radiation below the threshold frequency does not eject any electron from the metal no matter how bright it is.
• wave theory says that :more intense radiation ,regardless of frequency ,has stronger magnetic and electric fields,the electric field eject the electron from the metal,there should be a delay of seconds before the faint light gained energy to be ejected.
• the experiment above (wave theory) was exactly contrast to the experiment of the photoelectric effect.

The photoelectric effect and einstein

• Photons is a quantum of light or electromagnetic radiation.
• 1900 Einstein proposed the idea that light is made up of photon, that interacted with the electrons in the metal like discrete particles,and not continous wave.
• his theory explained the existance of threshold frequency.(low frequency , does not have an energy needed to eject electron opposite of high frequency.)
• The photon behaves more like a particle than a wave.

The principle of complimentary and light

• light behaves both a wave and a particle(wave particle -wave duality)
• Niels Bohr clarified this situation by proposing the Principle of complimentary ("to understand a specific experiment ,one must use either the wave or the photon theory but both") the two aspect of light complement each other.
• *As a general rule,when light passes through space or through a medium ,its behaviour is best explained using its wave properties.But when light interacts with matter ,its behaviour is more like that of a particle*

homework:

Answer (booklet) # 17-20

next scribe will be ...hmmm.....echizenR18

Physics Class of November 4, 2008

Ohh obligatory blogging, thou art a piercing blow to the heart that effortlessly causes one to cease his/her endeavours in academics -_- Today was the first Tuesday of the month, so common sense dictates that it was a half day.

To succinctly summate our activities in class, we worked on a chart for the "Wave Theory of Light" labelled Appendix 2.4: Chart for Evaluating the Models of Light. From here, we were tasked to define supporting and counter arguments that dealt with the given "phenomena." This task was very self-evident. After that, we were to do questions 9, 10, 11 and 12 of the "The Nature of Light: Part 2 The Wave and Particle Models of Light Problems" booklet.

Here are the solutions predicated on my answers.

9) refer to that golden yet vague visual representation below

10) refer to that golden yet "inaccurate" image up above

11a) The wave theory says that the wavelength and speed both decrease for frequency remains the same despite the change in mediums. In this case, the mediums were from deep water to shallow water. Read this my fellow minions and acquaintances (just joking), light is slower in SHALLOW water as opposed to light DEEP water. Based on that, one can easily conclude that the wavelength and speed is lower in shallow water.

b) The Wave Theory suggests light moves slower in denser mediums while the Corpuscular Theory suggests light moves faster in denser mediums.

12) Mighty small !

And as well, the "BLM 2.10 : Contributions to the Determination of the Speed of Light" paper was to be handed in. This was the sheet where we were to entitled to choose a certain contributor to write about. From there, we were to fill out the chart.

Test Next Week Too ! Goodbye !

i choose you.... caaamy....