PeachyG
Answered

According to the Doppler Effect, which statement is true about a sound as it approaches you and then moves away.

AAs the source approaches you, the sound waves are compressed so the pitch of the noise increases.
BThe pitch of the sound remains the same the entire time, regardless of the direction of the source.
CAs the source moves away from you the sound waves are compressed so the pitch of the noise increases.
DAs the source approaches you, the sound waves are stretched relative to the individual so the pitch of the noise decreases.

Verified Answer :

AL2006

As the source approaches you, the sound waves are compressed, so
the pitch of the sound is higher than what the source is actually emitting.

Then, after it passes you and begins moving away, the sound waves
are stretched, so the pitch of the sound is lower than what the source
is actually emitting.

A) As the source approaches you, the sound waves are compressed so the pitch of the noise increases.

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