Question

If a sound wave of wavelength 0.1 cm is traveling in air at a speed of 343 m/s. Is it audible to human beings?

• A. Yes
• B. No

Answer 1

The correct option is B

No

Given, Speed of the sound = 343 m/s

and, Wavelength = 0.1 cm= 0.001 m
We know that, Speed = Frequency x Wavelength
Thus, Frequency = $\frac{Speed}{Wavelength}$$=\frac{343m{s}^{-1}}{0.001m}=343000Hz$
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.