Question

A bat emits ultrasonic sound of frequency 1000 kHz in air. If the sound meets a water surface, what is the wavelength of the reflected sound.

Answer 1

speed of sound in air ,v = 340 m/s
given, frequency of the ultrasonic sound, f = 1000kHz = 10^6 Hz

The wavelength $\lambda_r$ of the reflected sound is given by the relation:

$\lambda_r=\frac{v}{f}$

= 340/10^6

= 3.4 × 10^-4 m

hence, Wavelength of reflected sound is $3.4\times10^{-4}m$