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The time of reverberation of a room A is one second. What will be the time (in seconds) of reverberation of a room, having all the dimensions double of those of room A?

1. 4
2. 1/2
3. 1
4. 2

Correct answer: 2

Solution

Reverberation time is proportional to the volume of the room divided by the surface area. Doubling all dimensions increases the volume by 8 times and the surface area by 4 times, so the reverberation time doubles.

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