The temperature at which the speed of sound in air becomes double of its value at ${27^o}C$ is ... $^oC$
AIPMT 1993, Medium
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$v = \sqrt {\frac{{\gamma RT}}{M}} $ ==> $v \propto \sqrt T $
i.e. if $v$ is doubled then $T$ becomes four times,
hence ${T_2} = 4{T_1} = 4(273 + 27) = 1200K = 927^\circ C$
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