A ringing electric bell is kept inside a glass jar and a vacuum pump is attached to it.
What will happen, if we ring the bell and gradually pump out the air inside the glass jar?

The sound will gradually increase.

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The sound will gradually decrease until it reduces to zero.

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The sound will first decrease, but then it will increase.

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The sound will be the same as before.

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Solution

The correct option is B The sound will gradually decrease until it reduces to zero.
As we all know, sound requires a medium to travel. It cannot travel through vacuum.
When we gradually pump out the air from the glass jar, we are slowing creating vacuum inside the jar.
Hence, the sound of the ringing bell inside the glass jar will gradually decrease until all the air is pumped out.

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A ringing electric bell is kept inside a glass jar and a vacuum pump is attached to it. What will happen, if we ring the bell and gradually pump out the air inside the glass jar?

A ringing electric bell is kept inside a glass jar and a vacuum pump is attached to it.
What will happen, if we ring the bell and gradually pump out the air inside the glass jar?