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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).

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