Question

We can hear sound from longer distance during monsoon .Why?

Answer 1

Explanation:

The speed of sound depends upon the temperature. Higher the temperature, faster the sound travels.

During a warm summer day, the ground heats up but the atmosphere is relatively cooler. The sounds wants to minimize its entropy (by travelling at a lower speed, by travelling through a medium with lower temperature) so it bends upwards. That is, the sound tries to go high up in the atmosphere and is basically lost. This sound may return back to the ground due to reflection due to clouds etc but this would only be a small part of initial sound energy.

During monsoon (or winters), as the ground becomes cooler, the sound bends DOWN (towards the ground) and keeps bouncing off the ground and therefore, travel large distances.