Indiana Science Grade 7

Chapter 14: Waves, Sound, and Light

Sound Waves

1.
Which of the following best describes why refraction of a wave occurs when the wave travels from one material into another?
A)The speed of the wave changes.
B)The wavelength increases.
C)The amplitude increases.
D)The frequency decreases.
2.
The amount of energy that a wave carries past a certain area each second is the ______.
A)intensity
B)pitch
C)amplitude
D)frequency
3.
Which of the following are units for measuring intensity?
A)decibels
B)hertz
C)meters/second
D)meters
4.
Through which of these materials does sound travel fastest?
A)water
B)air
C)steel
D)empty space
5.
The speed of sound waves depends on the material in which the waves travel and its _______.
A)temperature
B)frequency
C)pitch
D)refraction
6.
_______ is the repeated echoes of sound waves.
A)Reverberation
B)Refraction
C)Frequency
D)Reflection
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