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Speed of Sound

The audible f...

Question

The audible frequency for a normal human being is 20 Hz to 20 kHz. Find the corresponding wavelengths if the speed of sound in air 320 m/s.

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Solution

Speed of sound= $w a v e l e n t h \times f r e q u e n c y$
when frequency is 20Hz
then wavelength= $\frac{344}{20}$ =17.2m
when frequency is 20KHz
then wavelength= $\frac{344}{20000}$ (20KHz = 20000Hz)
=0.0172m

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