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Q.

Is it true that we can hear the sound of an electric bell kept inside a jar in which a vacuum is created by a suction pump?


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a

True

b

False 

answer is B.

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Detailed Solution

The above statement is False.
It is not possible to hear the sound of an electric bell in the above case as there is no medium wave for the sound to travel. Sound waves need a medium to travel. Sound waves are nothing but the transfer of vibrating energy from one particle to another without moving from its original position.
The correct statement would be that we cannot hear the sound of an electric bell kept inside a jar in which a vacuum is created by a suction pump.
 
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