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An electric drum is enclosed inside a sp...

An electric drum is enclosed inside a specially designed closed glass chamber, as shown in the given figure. On switching the current, the hammer repeatedly strikes the membrane of the drum. Hence, the membrane vibrates and produces sound that can be heard at a distance. Now, the chamber is evacuated by closing the switch of the vacuum pump.

As the chamber is evacuated, the

A

frequency of hammering decreases

B

membrane stops vibrating

C

hammer stops striking

D

sound cannot be heard

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