At what temperature velocity of sound is double than that of at $0°C$
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(b) $v \propto \sqrt T $
==> $\frac{{{v_2}}}{{{v_1}}} = \sqrt {\frac{{{T_2}}}{{{T_1}}}} $
==>$2 = \sqrt {\frac{{{T_2}}}{{(273 + 0)}}} $
$ \Rightarrow $ ${T_2} = 273 \times 4 = 1092\,K = {819^o}C$
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