A train whistling at a constant frequency n_0 | vedclass

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(C) According to the Doppler effect, when a source of sound moves towards a stationary observer, the observed frequency $n'$ is given by $n' = n_0 \le

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(C) According to the Doppler effect, when a source of sound moves towards a stationary observer, the observed frequency $n'$ is given by $n' = n_0 \left( \frac{v_s}{v_s - v} \right)$, where $v_s$ is the speed of sound. This frequency remains constant as long as the train approaches at a constant speed.When the train passes the observer and moves away, the observed frequency $n''$ is given by $n'' = n_0 \left( \frac{v_s}{v_s + v} \right)$.Since $n' > n_0$ and $n'' Therefore, the graph will show a constant higher frequency before the train passes and a constant lower frequency after the train passes, with a sharp discontinuity at the moment of passing.

$A$ train whistling at a constant frequency $n_0$ is moving towards a station at a constant speed $v$. The train passes a stationary observer on the station. The frequency $n$ of the sound as heard by the observer is plotted as a function of time $t$. Identify the expected curve.

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