Unit Test on Waves

A girl stands 160 m away from a high wall and claps her hands at a steady rate so that each clap coincides with the echo of the one before. If her clapping rate is 60 per minute, state the value this gives for the speed of sound.

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NGSS.HS-PS4-1

If she moves 40 m closer to the wall she finds the clapping rate has to be 80 per minute. Calculate the value these measurements give for the speed of sound.

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NGSS.HS-PS4-1

She moves again and finds the clapping rate becomes 30 per minute. Calculate how far she is from the wall if the wave speed of sound is the value you found in question 1

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NGSS.HS-PS4-1

Draw the waveform of

1. a loud, low-pitched note

2. a soft, high-pitched note.

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NGSS.HS-PS4-1

If the speed of sound is 340 m/s what is the wavelength of a note of frequency

1. 340 Hz

2. 170 Hz?

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NGSS.HS-PS4-1

Explain with reference to a sound wave what is meant by the terms

1. compression

2. rarefaction.

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State how far a compression and the nearest rarefaction are apart in terms of the wavelength of a sound wave.

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NGSS.HS-PS4-1

A sound wave has a frequency of 220 Hz and travels in air with a speed of 330 m/s. Calculate the distance between consecutive rarefactions.

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NGSS.HS-PS4-1

Name the state of matter in which

sound waves travel faster

• solid

• liquid

• gass

Name the state of matter in which

sound waves travel the slowest

• gass

• liquid

• solid