A source of frequency 300 Hz moves through still air at 30 m/s. The speed of sound is 330 m/s. If the wavelength immediately ahead of the moving source is N metres, find N.
Physics · Wave Motion · doppler effect
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Question

A source of frequency 300 Hz moves through still air at 30 m/s. The speed of sound is 330 m/s. If the wavelength immediately ahead of the moving source is N metres, find N.

G1 Physics · Accepted Answer

For a moving source, λ₁ = (v−uₛ)/f. Substitute: λ₁ = (330−30)/300 = 300/300 = 1 m. Hence, N = 1.