The speed of sound in air at 20 C is 344 m/s. Part A What is the wavelength of a

Question

The speed of sound in air at 20 C is 344 m/s.

Part A

What is the wavelength of a sound wave with a frequency of 784 Hz, corresponding to the note G5 on a piano?

0.439

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Correct

Part B

How many milliseconds does each vibration take?

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Part C

What is the wavelength of a sound wave one octave higher than the note in part A?

The speed of sound in air at 20 C is 344 m/s.

Part A

What is the wavelength of a sound wave with a frequency of 784 Hz, corresponding to the note G5 on a piano?

=

0.439

m

SubmitMy AnswersGive Up

Correct

Part B

How many milliseconds does each vibration take?

T = ms

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Part C

What is the wavelength of a sound wave one octave higher than the note in part A?

= m

Explanation / Answer

  v = f
344 m/s = (784 s^-1)()
= 0.439 m

T = 1/f
T = 1/(784 s^-1)
T = 1.28e-3 s = 1.28 ms

Sound an octave higher would have twice the frequency and half the wavelength:
= 0.439/2 m = 0.220 m

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