A train whistling at constant frequenc...

A train whistling at constant frequency 'n' is moving towards a station at a constant speed V. The train goes past a stationary observr on the station . The frequecy 'n' of the sound as heard by the observe is plotted as function of time 't' . Identify the correct curve .

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

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