A Bell Is Ringing Inside of a Sealed Glass Jar

question 44

Multiple Choice

A bell is ringing inside of a sealed glass jar that is connected to a vacuum pump. Initially, the jar is filled with air. What does one hear as the air is slowly removed from the jar by the pump?

• A)The sound intensity from the bell gradually decreases.
• B)The frequency of the sound from the bell gradually increases.
• C)The frequency of the sound from the bell gradually decreases.
• D)The speed of the sound from the bell gradually increases.
• E)The intensity of the sound from the bell does not change.

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