Chapter 15 Sound

What term is used to describe regions of minimum pressure or spacing in a longitudinal sound wave?

• Troughs

• Crests

• High points

• Rarefactions

In which of the following materials does sound travel the fastest?

• A) Carbon dioxide

• B) Orange juice

• C) Iron bar

• D) Maple syrup

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NGSS.MS-PS4-2

What is the approximate speed of sound in dry air at room temperature (around 20°C or 68°F)?

• A) 1,000 meters per second

• B) 343 meters per second

• C) 1,200 meters per second

• D) 300,000 meters per second

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If a thunderclap is heard 8 seconds after seeing the lightning, and the speed of sound on that day is approximately 330 meters per second, how far away is the lightning strike?

• 2640 meters

• 3300 meters

• 26400 meters

• 33000 meters

Which of the following terms describes the maximum displacement of particles in a sound wave from their rest position?

• Wavelength

• Frequency

• Amplitude D

• Hertz

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What is the approximate range of frequencies that the average human can hear without difficulty?

• 20 Hz to 20 kHz

• 10 Hz to 10 kHz

• 5 Hz to 5 kHz

• 1 Hz to 1 kHz

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What principle of ultrasound imaging allows us to determine the depth of an object by measuring the time it takes for sound waves to travel to and from the object?

• Reflection

• Refraction

• Diffraction

• Interference

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Which wave has the greatest amplitude?

• A

• B

• C

• D

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The pitch of a sound is most closely related to the

• frequency  of the sound waves

• distance from the sound source

• medium through which the sound travels

• intensity of the sound

How loud or soft a sound is, is related to the _____________ of the wave

• amplitude

• frequency

• wave length

• rest position

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