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At what temperature, the speed of sound in the air will become double of its value at 27°C?

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At what temperature, the speed of sound in the air will become double of its value at 27°C?

(a) 54°C

(b) 627°C

(c) 327°C

(d) 927°C
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The correct answer is (d) 927°C

Explanation: As of v∝√T

v/2v=√((273+27)/T)

T=1200K=927℃.
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