Waves - Chapter 12

Question 1

What is superposition

Answer 1

when two of the same wave types meet, they superpose when they overlap. They produce a single wave of instantaneous displacement as a sum of the displacements of the indivual waves at that point

Question 2

what is coherence

Answer 2

when two waves emitted from two sources have a constant phase difference and have the same frequency

Question 3

PLD LINK TO PD

Answer 3

when path difference is an even multiple of 1/2 pi and phase difference is a multiple of 2pi it is constructive interference

when path difference is an odd multiple of 1/2 pi and phase difference is an odd multiple of pi there is destructive interference

Question 4

how to measure the wavelength of light using a double slit

Answer 4

aim laser at a double slit

measure the distance between using several fringes in the interference pattern produced

measure the distance D

the double slit will have a known separation

use lambda = ax /D

Question 5

experiment to show superposition of light

Answer 5

young double slit,

Question 6

experiment to show superposition of microwaves

Answer 6

microwaves are shot from a transmitter to s double slit where two coherent sources will interfere

Question 6

experiment to show superposition sound

Answer 6

signal generator connected to two speakers to produce coherent sound - microphone is moved parallel

Question 7

formulas to determine wavelength

Answer 7

using a double slit, lambda = ax / d
a is separation between slits
x is operation between fringes
d is distance form slit to wall
using diffraction grating, d sin theta = n x lambda
n is the order of the maxima
theta is the angle between the 0th and nth maxima
d is the number of slits between each slit which is given per cm