Concepts Of Physics MCQ Edition [Volume 1]PhysicsSound Waves

A source of sound travels towards an observer.

Options

AThe frequency of the source increases.
BThe vibration amplitude of the particles increases.
CThe speed of sound in the medium increases.
DThe wavelength of the sound in the medium towards the observer decreases.

Correct answer

D. The wavelength of the sound in the medium towards the observer decreases.

Step-by-step solution

When a source of sound moves towards an observer, the successive wavefronts emitted by the source are compressed in the direction of motion. The apparent wavelength ' in the medium towards the observer is given by ' = v - v_s f , where v is the speed of sound in the medium, v_s is the speed of the source, and f is the actual frequency of the source. Since v_s > 0 , we have ' The actual frequency of the source and the speed of sound in the medium depend on the source characteristics and medium properties respectivel

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