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Question

A sound wave is travelling in air at a speed of 343 m/s. The wavelength of the sound wave is 0.1 cm. Find the frequency of the sound wave. Is the sound audible to humans?


  1. Yes, 20000 Hz
  2. No, 20000 Hz
  3. Yes, 343000 Hz

  4. No, 343000 Hz


Solution

The correct option is D

No, 343000 Hz


Speed of the sound = 343 m/s
We know that, speed = frequency × wavelength
Wavelength = 0.001 m
Thus, frequency = speedwavelength = 343000 Hz
As the frequency of the sound is beyond 20,000 Hz, it is beyond the audible range of humans.

Hence, the sound is inaudible to humans.

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