When a bell rings inside a jar and the air is slowly removed, what happens to the sound?

Question

When a bell rings inside a jar and the air is slowly removed, what happens to the sound? — Exam MCQ

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B. The sound becomes fainter as air is removed — Sound needs a material medium. As air is removed, less sound reaches the listener, so the bell becomes fainter.

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A. The bell stops vibrating immediately as air is removed

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C. The sound becomes louder

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D. The pitch of the sound increases

When a bell rings inside a jar and the air is slowly removed, what happens to the sound?

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