A railway engine whistling at a constant frequency moves with a constant speed. It goes past a s... VIDEO
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 heard by the observer is plotted against time \( t \). Which of the following best represents the resulting curve?https://bit.ly/YTAI_PWAP https://www.pw.live
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