Chapter - 5 Sound

Q&A -Ask Doubts and Get Answers

Q
Sound

Question:

A sound wave travels at a speed of 339 m/s. If its wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

Answer:

Given: 

Speed of sound, v = 339 ms^{-1}

Wavelength of sound, lambda = 1.5 cm = 0.015 m

We know,

Speed of sound = wavelength 	imes frequency

v = lambda 	imes 
u


u = frac{v}{lambda }


u = frac{339}{0.015} = 22600 Hz

The frequency of audible sound for human beings lies between the ranges of 20 Hz to 20,000 Hz. The frequency of the given sound is more than 20,000 Hz, therefore, it is not audible.


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