The sound waves after being converted into electrical waves are not transmitted as such because-

Options

A. they are absorbed by the atmosphere
B. they have constant frequency
C. the height of antenna required should be very high
D. velocity of sound waves is very less

Answer

A

Explanation

There are several factors which affect the propagation of sound. These are geometric spreading, atmospheric effect and surface effects. There are two mechanisms by which absorbed by the acoustic atmosphere. These are molecular relaxation and viscosity effects. The absorption depends on the temperature and humidity of the atmosphere.