If a Sound Source Is Approaching You, It Will Sound

Multiple Choice

If a sound source is approaching you, it will sound slightly higher in frequency to you than it would to an object moving along with it.Similarly, if a sound source is receding from you, it will sound slightly lower in frequency to you than it would to an object moving along with it.This phenomenon is called the ______.

A) rate of approach effect
B) biosonar shift
C) Gelb effect
D) Doppler shift