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 represents the variation of frequency of sound n heard by the observer with the time t ?[Assume, medium is stationary. Source and observer are collinear]

A railway engine whistling at a constant frequency moves with a consta

1.	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 represents the variation of frequency of sound n heard by the observer with the time t ?[Assume, medium is stationary. Source and observer are collinear]
Answer» 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 represents the variation of frequency of sound $n$ heard by the observer with the time $t$ ? [Assume, medium is stationary. Source and observer are collinear]

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