In the experiment of an electric bell in a vacuum jar, the speed of sound waves is

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Sonic speed

Infrasonic speed

Ultrasonic

zero

answer is D.

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Detailed Solution

In the experiment of an electric bell in a vacuum jar, the speed of sound waves is zero.
Sound waves need a medium to travel. This is because sound waves are nothing but the transfer of vibrating energy from one particle to another without moving from its original position. In the above case, a vacuum is created, so the sound waves can't travel. So there will be no sound wave movement, and speed will be zero.

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