Question

A police siren emits a sinusoidal wave with frequency $f_s=300Hz$. The speed of sound is $340m/s$. The wavelength of the waves if the siren is at rest in the air is $113\times {10}^{-x}m$. Find $x$.

Answer 1

As the source is at rest , therefore wavelength of waves in air is given by ,

$\lambda =v/f=340/300=1.13m=113\times {10}^{-2}$.

Therefore, $x=2$.