The wavelength is $120 cm$ when the source is stationary. If the source is moving with relative velocity of $60\, m/sec$ towards the observer, then the wavelength of the sound wave reaching to the observer will be ... $cm$ (velocity of sound $= 330 \,m/s$)
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$n' = n\,\left( {\frac{v}{{v - {v_s}}}} \right)$
$\Rightarrow$ $\lambda ' = \lambda \left( {\frac{{v - {v_S}}}{v}} \right)$
$\Rightarrow$ $\lambda ' = 120\,\left( {\frac{{330 - 60}}{{330}}} \right) = 98\,cm.$
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