In a medium sound travels $2\, km$ in $3\, sec$ and in air, it travels $3 \,km$ in $10\, sec$. The ratio of the wavelengths of sound in the two media is
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(d) $v \propto \lambda $
==> $\frac{{{\lambda _1}}}{{{\lambda _2}}} = \frac{{{v_1}}}{{{v_2}}} = \frac{{2/3}}{{3/10}} = \frac{{20}}{9}$
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