Question

If source and observer are moving away appearent frequency

Answer 1

Answer:

fade away

Explanation:as the sources move farther away from each other the sound will eventually be gone.

Answer 2

Answer:

decreases

Explanation:

according to the formula:    

appearent frequency =( v-Us/ v+Uo) f

us = - because it is moving away

uo = + because it is moving away