If the ratio of coefficient of thermal conductivity of silver and copper is $10 : 9$ , then the ratio of the lengths upto which wax will melt in Ingen Hausz experiment will be
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(b) ${K_1}:{K_2} = l_1^2:l_2^2 \Rightarrow \frac{{{l_1}}}{{{l_2}}} = \sqrt {\frac{{{K_1}}}{{{K_2}}}} = \sqrt {\frac{{10}}{9}} = \frac{{\sqrt {10} }}{3}$
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