1. a mechanical wave can be defined by which of the following? (1 point)
carries energy from one place to another
moves through solids, liquids, and gasses
is created when a source of energy creates a vibration
all of the above

2. which type of mechanical wave needs a source of energy to produce it? (1 point)
a transverse wave
a longitudinal wave
a surface wave
all of the above

3. a wave has a wavelength of 20 mm and a frequency of 5 hertz. what is its speed? (1 point)
100 mm/s
100 hertz/s
4 mm/s
25 mm/s

4. to what is amplitude related? (1 point)
the amount of energy carried by the wave
the maximum displacement from the rest position
neither a nor b
both a and b

5. in refraction, when a wave travels from one medium to another, it (1 point)
changes speeds.
stays in step.
always moves in the same direction.
travels in the opposite direction.

6. a piano, violin, or guitar uses the resonance of a wooden soundboard to (1 point)
amplify the sound.
dampen the sound.
raise the pitch.
limit standing waves.

7. when a sound source approaches you, the pitch you hear is (1 point)
lower when the source is stationary.
higher than when the source is stationary.
the same as when the source is stationary.
first higher and then lower than the pitch of the source when stationary.

8. the part of the ear that sends coded nerve signals to the brain is (1 point)
the outer ear.
the inner ear.
the middle ear.
the eardrum.