Question

1. As the moving sound source passes by, the pitch heard is lower due to

the lower frequency waves behind the moving source

the higher frequency waves behind the moving source

the waves behind have lower amplitude

the waves behind have higher amplitude

2. When sound comes from a moving source, the sound waves in front and in back of the source
cannot be heard from the side

are not as loud as those heard from the side

have different pitches

have different potential energies

Answer 1

Please I really need your help!

Answer 2

I know the second one is "have different pitches"

Answer 3

This is not a social science question.