A column of air and a tuning fork produce 4 beats per sec when soun...

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A column of air and a tuning fork produce 4 beats per sec when sounded together. The tuning fork gives the lower note.
\( \mathrm{P} \) The temperature of air is \( 15^{\circ} \mathrm{C} \). When the temperature falls to

W \( 10^{\circ} \mathrm{C} \) the two produce 3 beats per sec. Find the frequency of the fork.
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