Physics - Sound Wave Question with Solution | TestHub

Horseshoe bats (genus Rhinolophus) emit sounds from their nostrils and then listen to the frequency of the sound reflected from their prey to determine the prey's speed. (The "horseshoe" that gives the bat its name is a depression around the nostrils that acts like a focusing mirror, so that the bat emits sound in a narrow beam like a flashlight.) A Rhinolophus flying at speed ${\mathrm{v}}_{\mathrm{bat}}$ towards insect emits sound of frequency $f_{\text{bat }}$; the sound it hears reflected from an insect flying toward it has a higher frequency $f_{\text{refl }}$. The speed of the insect is given by (Given speed of sound is $v$ )