A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f ) of the sound by the observer is plotted against time (t ). Which of the

Question

A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f ) of the sound by the observer is plotted against time (t ). Which of the following best represents the resulting curve?

Quantrex Academy · Accepted Answer

Correct answer: 3

When the engine approaches the observer, (f₁=f ( v v-v_s )>f but constant. ) When it moves away from the source, (f₂=f ( v v+v_s ) < f but constant. )

A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer standing beside the railway track. The frequency (f ) of the sound by the observer is plotted against time (t ). Which of the following best represents the resulting curve?

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