Wave Properties
Wave
Behaviour
Behaviour
Wave
Calculations
Calculations
Standing Waves
Surprise!
100
What occurs when two crests of a wave meet?
Constructive interference
100
What is diffraction
100
The frequency of a wave is 2 Hz. What is the period?
T = 1/f = 1/2 = 0.5 seconds
100
What are the areas of no displacement called on a standing wave?
Nodes
100
What kind of energy does a spring have at its amplitude positions and what is the equation?
Elastic potential energy, 1/2 k x2
200
The number of waves per second.
What is the frequency?
200
An echo is a sound wave that we hear that is caused by this wave property.
What is reflection?
200
What is the wavelength?
10 cm
200
How many nodes and antinodes are in the standing wave below?
7 nodes, 6 antinodes
200
What length should you make a pendulum to make its period be 1.5 seconds?
0.56 m
300
What is amplitude?
The measure of how high or low a wave is. (The max. displacement from equilibrium position)
300
The change in direction of propagation of any wave as a result of it traveling at different speeds at different points along the wave front.
What is refraction?
300
The speed of sound in air, at room temperature is 340 m/s. If the wave length of a sound wave is 2 m, determine the frequency of the sound.
120 Hz
300
What is the wavelength of the standing wave below?
2.5 m
300
A 5 kg mass stretches a spring 20 cm when it is hung vertically. What is the spring constant of the spring?
250 N/m
400
What is sound?
A longitudinal, mechanical wave
400
What is total internal reflection?
400
The index of refraction of glass is 1.5. What is the speed of light in glass?
n=c/v => v=c/n = 2*10^8 m/s
400
A standing wave on a string 20 m long is vibrating in the 4th harmonic. What is the wavelength of the wave?
10 m
400
A boat is at the top of a wave crest. The adjacent crest is 4 meters away. It takes the boat 8 seconds to go down and back up to its original position. Determine the speed of the waves.
0.5 m/s
500
Crests and troughs can be found in transverse waves...what can be found in longitudinal waves?
Compressions and rarefactions
500
A light ray travels in air and is incident on the surface of water at an angle of 45o. Describe two things about the transmitted ray.
Any two of:
Shorter wavelength
slower speed
refracted ray bends towards normal
500
A ray of light travels from a medium with index of refraction of 2, to air. Determine the critical angle.
theta = 30^o
500
If the length of the standing wave below is 12 m, and it makes 100 cycles in 20 seconds, what is the speed of the wave?
40 m/s
500
A 2 kg mass on a spring oscillates horizontally in simple harmonic motion. If the velocity of the mass as it passes through equilibrium is 10 m/s, what is the total energy of the system?
100 J