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Two tuning forks A and B give 18 beats "...

Two tuning forks `A and B` give `18 beats "in" 2 s`. A resonates with one end closed air column of `15 cm` long and `B` with both ends open column of `30.5` long. Calculate their frequencies.

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The correct Answer is:
549 Hz and 540 Hz
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NN GHOSH-VIBRATIONS OF COLUMNS-EXERCISE
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