Question

Which statement does NOT explain the concept of the Doppler Effect? A) As an observer approaches a stationary sound, the sound waves are compressed, making the pitch higher. B) As an observer moves away from a stationary sound, the sound waves are stretched making the pitch lower. C) As a sound source approaches a stationary object, the sound waves are compressed, making the pitch higher. D) As a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch.

Answer 1

The answer is D) As a sound source moves away from a stationary object, the sound waves are compressed, increasing the pitch.  This statement does not explain the concept of Doppler Effect.  Due to the Doppler effect, the pitch decreases as the sound moves away from you.