A railway engine whistling at a constant (1) frequency moves with a constant speed. It goes past...

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A railway engine whistling at a constant
(1) frequency moves with a constant speed. It goes past a stationary observer standing heside the railway track. The frequency \( (\mathrm{n}) \) of the sound heard by the observer is plotted against time ( \( t \).
(2) (PD) Which of the following best represents the resulting curve?
(3)
(4)
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