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!

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!