The temperature at which the speed of sound becomes double

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The temperature at which the speed of sound becomes double as was at 27°C is

1. 273° C
2. 0° C
3. 927° C
4. 1027°C

Correct Option: C

We have c ∝ √T

∴	c₁	= √	T₁
	c₂		T₂

⇒	c₁	= √	(27 + 273)k
	2c₂		T₂

⇒ T₂ = 1200k = 927°C