Basics
What is the highest point of a wave?
The crest
a node
This is a measure from a crest to crest or trough to trough.
wavelength
If an image in a mirror appears upside down it is said to be?
inverted
15 m/s
If the medium of a wave is moving in the same direction as the wave, what type of wave is it?
Longitudinal
True or false: doubling the frequency of a wave (without altering the medium) doubles the speed of the wave.
False
constructive interference
If an image appears to be behind a mirror the image is said to be?
virtual
An ocean wave has a wavelength of 6 meters and a speed of .3 m/s. What is its frequency?
v=lambda(f) = 0.05Hz
In a transverse sound wave, which way do the particles move?
Perpendicular to the wave
If the frequency of a wave is doubled and if the speed remains constant, its wavelength is?
halved
When two waves collide and cancel out this is called?
destructive interference
If an image appears smaller than it actually is in a mirror then it is said to be
Reduced
A pendulum makes 80 vibrations in 20 s. What is the period of the pendulum (including correct units)?
0.25 s
What is the main factor affecting the speed of sound?
The properties of the medium
A train is moving towards you. The whistle sounds higher pitched as it approached. This phenomenon is described as:
the doppler effect
All waves require a medium: true or false?
False
When light bends when it enters a new medium it is called?
refraction
A wave whose speed in a slinky is 10 m/s enters a second slinky. The wavelength changes from 4.0 m to 3.0 m. The wave in the second slinky travels at approximately
7.5 m/s
A wave leaving a prism speeds up as enters the air, what happens to the wavelength?
It will increase
The Very Large Array radio telescope in New Mexico is receiving a radio signal from a source in outer space. If the frequency of the waves are observed to be decreasing, then the distance between the source and the earth is probably ____.
increasing
A ray of light travels from air, with a refraction index of n1=1, to a glass block with a refraction index of n2=1.4. If the incident angle of the light ray is angle 1=30∘, what is the refracted angle?
21 degrees
when a wave bends as it goes around a corner or through a slit it is called?
diffraction
A 3.0-meter long rope is hanging vertically from the ceiling. A single pulse is observed to travel to the end of the rope in 0.50 s. What frequency should be used by the vibrator to maintain 4 whole waves in the rope?
v=d/t=3/.5= 6 m/s
divide by length of rope, times number of waves:
6/3*4 = 8 Hz