Q. The Doppler frequency increases as the target

A
Approaches the radar
B
Recedes the radar
C
Moves perpendicular to the beam
D
Does not depend on the target velocity
Solution:

The doppler shift affects the wave incident upon the target as well as the wave reflected back to the radar, the change in frequency observed by a radar due to a target moving at relative velocity is twice that from the same target emitting a wave.

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