A source of sound is moving towards a station | vedclass

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(A) According to the Doppler effect, when a source moves towards a stationary observer, the apparent frequency $n_1$ is given by: $n_1 = n \left( \fra

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$\frac{2nV V_s}{V^2 - V_s^2}$

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(A) According to the Doppler effect, when a source moves towards a stationary observer, the apparent frequency $n_1$ is given by: $n_1 = n \left( \frac{V}{V - V_s} \right)$.When the source moves away from the stationary observer, the apparent frequency $n_2$ is given by: $n_2 = n \left( \frac{V}{V + V_s} \right)$.The difference between the apparent frequencies is $\Delta n = n_1 - n_2$.$\Delta n = n \left( \frac{V}{V - V_s} - \frac{V}{V + V_s} \right)$.$\Delta n = nV \left( \frac{(V + V_s) - (V - V_s)}{(V - V_s)(V + V_s)} \right)$.$\Delta n = nV \left( \frac{2V_s}{V^2 - V_s^2} \right) = \frac{2nVV_s}{V^2 - V_s^2}$.

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