Sound Waves

As a result of a distant explosion, an observer first senses a ground tremor and then hears the explosion. What accounts for this time lag?

• Sound travels faster than seismic waves.

• Seismic waves travel faster than sound.

• Light travels faster than sound.

• Sound and seismic waves travel at the same speed.

Why must soldiers break their march when crossing a bridge?

• To avoid making too much noise

• To prevent the bridge from resonating

• To maintain discipline

• To save energy

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The decibel level of an orchestra is 90 dB, and a single violin achieves a level of 70 dB. How does the sound intensity from the full orchestra compare with that from the violin alone?

• The orchestra is 10 times more intense.

• The orchestra is 20 times more intense.

• The orchestra is 100 times more intense.

• The orchestra is 200 times more intense.

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A pipe that is open at both ends has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s. What is the length of this pipe?

• 0.52 m

• 0.48 m

• 0.45 m

• 0.50 m

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What are the next two harmonics of a pipe open at both ends with a fundamental frequency of 320 Hz?

• 640 Hz and 960 Hz

• 480 Hz and 640 Hz

• 320 Hz and 480 Hz

• 960 Hz and 1280 Hz

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A closed pipe has a fundamental frequency of 320 Hz when the speed of sound in air is 331 m/s. What is the length of this pipe?

• 0.26 m

• 0.52 m

• 0.41 m

• 0.83 m

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NGSS.HS-PS4-1

For a closed pipe with a fundamental frequency of 320 Hz, what is the third harmonics?

• 1600 Hz

• 2240 Hz

• 960 Hz

• 640 Hz

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What wavelength of the lowest frequency humans can hear (20 Hz)? speed of sound is 343 m/s

• 17 m

• 6860 m

• 0.058 m

• 0.58 m

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What is the speed of sound in air at room temperature and standard atmospheric pressure?

• 343 m/s

• 300 m/s

• 330 m/s

• 350 m/s

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How do you calculate the wavelength of a sound wave?

• Wavelength = Speed of Sound / Frequency

• Wavelength = Frequency / Speed of Sound

• Wavelength = Speed of Sound x Frequency

• Wavelength = Frequency x Speed of Sound

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