Question

The relative motion between a source of sound and listener causing an apparent change in the frequency of perceived sound, is called:

• A. Placebo effect
• B. Oersted's effect
• C. Archimedes' effect
• D. Doppler effect

Answer 1

The correct option is D Doppler effect

When ever there is a relative motion between a source and a listener, the frequency of the sound heard by the listener is different from the original frequency of sound emitted by the source. This effect was first discovered by Christian Doppler, and hence, is is known as the “Doppler effect”.