NEET Physics Beat Frequency MCQ Question
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.
384
386
376
374
Correct Answer
Detailed Explanation
The beat frequency is the difference between the frequencies of the two forks. Initially, the beat frequency is 4 Hz, so the frequency of A could be either 384 Hz or 376 Hz. When A is loaded with wax, its frequency decreases, and the beat frequency becomes 2 Hz, confirming that the original frequency of A was 384 Hz.
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