Question
Physics Question on Electromagnetic waves
Sound waves are not transmitted a long distance because
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
they are absorbed by the atmosphere
Explanation
Solution
There are several factors which affect the propagation of sound. These are geometric spreading, atmospheric effect and surfaces effects. There are two mechanisms by which acoustic energy is absorbed by the atmosphere. These are molecular relaxation and viscosity effects. The amount of absorption depends on the temperature and humidity of the atmosphere.