Question

A sound wave of wavelength $25\text{m}$ travels at a speed of $350\text{m/s}$. Is it audible for a human being? Explain.
$\left[3\text{marks}\right]$

Answer 1

Given,
Speed of sound, $V=350\text{m/s}$
Wavelength, $\lambda =25\text{m}$
Frequency of given sound wave,
$f=\frac{V}{\lambda }=\frac{350}{25}=14\text{Hz}$
$\left[1.5\text{marks}\right]$
The frequency of the given sound wave falls in the infrasonic region $(f<20\text{Hz})$. Therefore, it is not audible for human beings as it is not in the audible range $(20\text{Hz}-20\text{kHz})$.
$\left[1.5\text{marks}\right]$