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JEE Main202628 January 2026Evening ShiftPhysicsWaves and SoundActual

Two tuning forks A and B are sounded together giving rise to 8 beats in 2 s. When fork A is loaded with wax, the beat frequency is reduced to 4 beats in 2 s. If the original frequency of tuning fork B is 380 Hz then original frequency of tuning fork A is _ _ _ _ Hz.

Correct answer

384

Step-by-step solution

|f_A - f_B| = 4 |f_A - 380| = 4 So, f_A = 384 Hz or 376 Hz on loading with wax f_A decreases So, f_A = 384 Hz

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