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JEE 2013 Advanced Doppler Effect Solution

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Solution

\nu  = \frac{{v + {v_o}}}{{v - {v_s}}}{\nu _0}

Where, vs and vo are with respect to the medium.

If wind blows from observer to the source,

{f_2} = \frac{{V + u - w}}{{V - (u + w)}}{f_1}

{f_2} > {f_1}

If wind blows from source to the observer,

{f_2} = \frac{{V + u + w}}{{V - (u - w)}}{f_1}

{f_2} > {f_1}

Hence, (A) & (B).