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  4. A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer beside the railway track. Which of the following graphs best represent the variation of frequency of the sound (n) heard by the observer with time (t) ?

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Q. A railway engine whistling at a constant frequency moves with a constant speed. It goes past a stationary observer beside the railway track. Which of the following graphs best represent the variation of frequency of the sound (n) heard by the observer with time (t) ?

KCETKCET 2002Oscillations

Solution:

Speed of engine is constant and the listner is at rest.