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Waves and Sound — Test Answers

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Which are examples of resonance? Choose three correct answers.

A
an echo
B
the volume on a stereo being turned up
C
a note being played on a saxophone
D
a person pushing a swing at the rate it naturally oscillates back and forth
E
an opera singer breaking a glass with her voice
22
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Ultraviolet light from a distant star is traveling at 3.0 meters meters per second How long will it take for the light to reach Earth if it must travel 4 point 0 times 10 to the 13th power kilometers ?

A
2 point 7 times 10 to the negative 2 power hours
B
1 point 3 times 10 to the 5th power hours
C
2 point 2 times 10 cubed hours
D
3 point 7 times 10 to the 4th power hours
23

What is the SI unit for intensity?

A
joule
B
mel
C
decibel
D
watt
24

Which best explains why sound travels fastest through a solid?

A
Sound is an electromagnetic wave, so a greater amplitude results in a greater speed.
B
Sound is an electromagnetic wave, so the medium does not affect the speed.
C
Sound is a mechanical wave, so closer molecules in the medium cause energy to transfer faster.
D
Sound is a mechanical wave, so if the volume of the medium is greater, more energy is transferred.
25

Question text not available

Answer:

wavelength

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Waves and Sound — Test Answers — Physics