Question

When a sound is reflected from a distant object, an echo is produced. Let the distance between the reflecting surface and the source of sound production remains the same. Do you hear echo sound on a hotter day?

Answer 1

An echo is heard when the time interval between the original and reflected sounds is at least 0.1 s. The speed of sound in a medium increases with an increase in temperature. Hence, the time interval between the original sound and the reflected sound will decrease on a hotter day. Therefore, an echo can be heard only if the time interval between the original sound and the reflected sound is greater than 0.1 s.