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Electric bell inside an evacuated bell jar, illustration. This illustrates an experiment to show that sound requires air for propagation. The bell is allowed to ring while the air is evacuated from the bell jar. The ringing noise gets quieter until a vacuum is achieved, when it is silent even though the mechanism is working.

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TOP26152756

Source:

達志影像

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RM

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須由TPG 完整授權

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N/A

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No

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