Question

A bat flying in a cave emits a sound and
receives its echo 0.2 s later.
How far away is the cave wall? Assume the
speed of sound to be 340 m/s.
Answer in units of m

Answer 1

it will take only half of the time for sound wave to travel to the wall, hence, the distance is

s=vt=340*0.1 = 34m