The temperature at which the speed of sound in air becomes double of its value at 27°C?
Answer: 927°C
Explanation
Speed of sound in air is proportional to the square root of absolute temperature v ∝ √T.
To double the speed, temperature must increase 4 times in Kelvin:
At 27°C = 300 K → 4 × 300 = 1200 K → 1200 - 273 = 927°C
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