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A room has negligible background noise. A sound is turned on with SIL = 100 dB....

A room has negligible background noise. A sound is turned on with SIL = 100 dB. After awhile, the sound is turned off rapidly. What is the SIL after a time interval equal to the reverberation time?

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Reverberation time is the time required for the sound to “fade away” or decay in a closed space. Sound in a room will repeatedly bounce off surfaces such as the floor, walls, ceiling, windows or tables.when these reflections mix, a phenomeon known as reverberation is created. Reverberation reduces when the reflections hit surfaces that can absorb sound such as curtains, chairs and even people.Actually the reverberation time of a room or space is defined as the time it takes for sound to decay by 60dB. So the SIL after a time interval equal to reverberation time is 40 dB.

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