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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 answer: 927°C

Solution

The speed of sound in a gas is proportional to the square root of its absolute temperature. Doubling the speed requires the temperature to increase by a factor of 4 in Kelvin. Starting from 27°C (300 K), the new temperature is 1200 K, which corresponds to 927°C.

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