# Problem: When a sound from a source is refracted away from the surface of the earth, it gives an indication that the A. wind is blowing in the direction of the sound. B. air has high humidity. C. ground is cooling faster than the air. D. air is cooler than the ground.

###### FREE Expert Solution

Sound waves are refracted away from the surface of the earth when the speed of sound increases and the height from the earth decreases.

Also, the speed of sound increases with an increase in temperature. That is, sound will be refracted away when the ground is hotter than the air above it.

###### Problem Details

When a sound from a source is refracted away from the surface of the earth, it gives an indication that the

A. wind is blowing in the direction of the sound.

B. air has high humidity.

C. ground is cooling faster than the air.

D. air is cooler than the ground.