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MHT CET Physics question

PhysicsWavesMHT CET

A tuning fork C of unknown frequency gives 4 beats/sec when sounded with another fork D of frequency 256 Hz. The fork C is now loaded with piece of wax and again 4 beats/sec are heard. Then the original frequency of fork C is :

Answer: (C)

Solution

Initially ; loading lowers , and for beats to remain 4/s it must have been 260 Hz and fallen to 252 Hz; if

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Question ID VK-069992