September 13 2007

Hi i am Richard and today i am the fifth period physics class scribe

Today we corrected the Chapter 14: Vocabulary review work sheet. If you did not get all the answers or any of the answers here they are;

1.Standing wave
2.Period
3.Destructive interference
4.Node
5.Amplitude
6.Normal
7. Principle of superposition
8.Transverse wave
9.antinode
10.Frequency
11.Interference
12.Wave length
13.Angle of incidence
14.surface wave
15.constructive interference
16.Trough
17.Diffraction
18.Angle of reflection
19.Longitudinal wave
20.Wave Pules
21.Refraction
22.traveling wave
23.Crest
24.Law of reflection


Then we went through the Green booklet. We looked over these sections

D. Reflection
E. Wave Transmission in Two Media
F. wave transmission and Partial Reflection in Two Media
G. Wave interference and the Principle of superposition
I. Standing waves: The formation of a nodes


After that we went over question 1 - 5 in the green booklet if you missed the answers here they are:

1. Longitudinal and Transverse Wave
2. f = 10 crest
. --------- = 0.1 Hz
. 100s


3. f = 580 kHz = 580 x 10 ^3
. v = 3 x 10 ^ 8 m/s
. Wavelength = ?
. v = f (wavelength)
. wavelength = v 3 x 10^8 m/s
. --- = --------------
. f 580 x 10^3 Hz
. Wavelenght = 520m

4. Wavelength = 2.5 cm = 2.5 x 10 ^-2m
. v = 1470 m/s
. t = ?
. v = wavelength/ t
. t = wavelength 2.5 x 10^2 m
. ------------ = --------------- = 1.7 x 10 ^-5 s
. v 1470 m/s

5. v = 450 m/s wavelength = 0.18 m A = 2.0 mm

a)

b) f = v 450 m/s
. --- = ---------
. wavelength 0.18m
. f = 2500 hz

c) T = 1/2500 = t x 10 ^ - 4 s

d) 1 km = 1000m/8 x 10 ^ -3m = 1.25 x 10 6 5 cycles / km

e) t = 1.25 x 10 6 5 cycles x 4 x 10 ^ -4s
. -------------
. cycles
. t = 50 s


After all that we should Finnish questions 6 - 14 in the green booklet


Welll That's what we did in class today and the next scribe will be .. christine d. ...