Sound (Grades 11-12)
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Sound
1.
Sound can travel long distances through water whereas light only penetrates a short distance.
- True
- False
2.
Telephones use electromagnets to change .
- electric currents to light waves
- electric currents to sound waves
- magnetism to light waves
- magnetism to sound waves
3.
A mechanical wave requires a medium through which to propagate and transfer its energy.
- True
- False
4.
Sound waves transfer their energy parallel to their movement of compressions and rarefactions. What kind of a wave is a sound wave?
- transverse
- radiant
- electromagnetic
- longitudinal
5.
The number of sound waves per unit time is called its .
6.
What is the frequency range of human hearing?
- 20 hertz to 20 kilohertz
- 2 hertz to 20 hertz
- 20 hertz to 200 hertz
- 2 hertz to 200 hertz
7.
Sound waves with a frequency above 20,000 Hz are referred to as
- infrasonic waves.
- ultrasonic waves.
- sonic booms.
- doppler waves.
8.
Explain the Doppler Effect. Include a real-world example in your explanation.
9.
When a sound source approaches an observer, the
- pitch become lower.
- pitch becomes higher.
- light becomes bluer.
- light becomes redder.
10.
The following equation approximates the speed of sound:
[math]v=[331.4+(0.6)("T in ºC")]m/s[/math]
As shown, temperature is one of the factors that affects the speed of sound. What is the speed of a sound wave in air with an average temperature of 20ºC?
[math]v=[331.4+(0.6)("T in ºC")]m/s[/math]
As shown, temperature is one of the factors that affects the speed of sound. What is the speed of a sound wave in air with an average temperature of 20ºC?
- 343 meters per second
- 343 meters per hour
- 300 million meters per second
- 300 million meters per hour
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