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Two tuning forks P and Q when set vibrat...

Two tuning forks `P` and `Q` when set vibrating , give `4` beats per second. If a prong of the fork `P` is filed, the beats are reduced to `2` per second . If a prong of the fork `P` is filed, the beats are reduced to `2` per second . Determine the original frequency of `P` , if that of `Q` is `250 H_(Z)`

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