Question

A source of sound moves towards an observer. What happens to the speed of sound in the medium?

(a) Increases

(b) Decreases

(c) Remains the same

(d) Depends on speed with which source moves

I have been asked this question in class test.

The origin of the question is Waves in section Waves of Physics – Class 11

Answer 1

Correct option is (c) Remains the same

To elaborate: Speed of sound in the medium depends on the properties of the medium like bulk modulus and density, not on the speed of source creating the sound.