$(a)\;20\;cms\qquad(b)\;60\;cms\qquad(c)\;50\;cms\qquad(d)\;80\;cms$

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Answer : (d) $\;80\;cms$

Explanation :

As the same wave is transmitted from one medium to another , frequency of the wave remains same .

frequency = $\;\large\frac{v_{1}}{\lambda_{1}}=\large\frac{v_{2}}{\lambda_{2}} \quad => \large\frac{350}{20} =\large\frac{1400}{\lambda_{2}}$

$\lambda_{2}=80\;cms\;.$

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