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When a tuning fork (vibrating) is held c...

When a tuning fork (vibrating) is held close to ear, one hears a faint hum. The same (vibrating tuning fork) is held such that its stem is in contact with the table surface, then one hears a loud sound. Explain.

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The table and the air-column in contact with it, vibrate with the frequency of the fork. Due to resonance. a londer sound is heard.
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