A tuning fork and an air column whose temperature \( \mathrm{P} \) ...

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A tuning fork and an air column whose temperature
\( \mathrm{P} \) is \( 51^{\circ} \mathrm{C} \) produce 4 beats in one second, when

W sounded together. When the temperature of air column decreases the number of beats per second decreases. When the temperature remains \( 16^{\circ} \mathrm{C} \) only one beat per second is produced. The frequency of the tuning fork is
(1) \( 100 \mathrm{~Hz} \)
(2) \( 75 \mathrm{~Hz} \)
(3) \( 150 \mathrm{~Hz} \)
(4) \( 50 \mathrm{~Hz} \)
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