Question

A sound wave travels at a speed of $330m/s.$ If the wavelength is $1.56cm$ what is the frequency of the wave? will it be audible for human

• A. $50Hz$
• B. $30Hz$
• C. $20Hz$
• D. $45Hz$

Answer 1

The correct option is C $20Hz$

$s=330$

$h=1.5cm=1.5/100=0.015$

$s\times h$

$330\times 0.015$

$=4.95Hz$

it Will not be audible as it less than $20Hz$

Hence,

option $\left(C\right)$ is correct answer.