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MHT CET Physics question

PhysicsWavesMHT CET

A tuning fork produces 5 beats per second with a tuning fork of frequency 480 Hz. When a little wax is stuck to a prong of fork , the number of beats heard per second becomes 2. What is the frequency of tuning fork before the wax was stuck to it? [MHTCET 2020]

Answer: (D)

Solution

Before loading, = 475 or 485 Hz; loading with wax lowers , and beats fall from 5 to 2 only if moves toward 480 Hz,

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Question ID VK-070359