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Tuning fork A when sounded with fork B of frequency 480Hz gives 5 beats per second. When the prongs of A are loaded with wax,

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Tuning fork A when sounded with fork B of frequency 480Hz gives 5 beats per second. When the prongs of A are loaded with wax, it gives 3 beats per second. Find the original frequency of A.

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fB = 480 Hz 

|fB – fA| decreases on waxing

∴ fA > fB

fA = 485 Hz  

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