Question

Doppler’s effect does not depend upon

• A. speed of source
• B. speed of observer
• C. frequency of sound
• D. separation between source and listener

Answer 1

The correct option is D separation between source and listener

Doppler's effect works on relative motion between source & listener.
Refer to formula of apparent frequency, it depends on the other three except option (d) i.e. separation between source and listener.