Unknown frequency of a tuning fork from beats before and after filing or loading with wax
This type of question, asked 2 times: 2021 Paper 26, 28 Jan 2026 S2. All 2 questions below, oldest first.
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Question 1
2021 Paper 26
1A tuning fork of unknown frequency produces 5 beats/s with a fork of known frequency 340 . When fork A filed, the beat frequency decreases to 2 beats/s. What is the frequency of fork A?Tap an option to check your answer.
Question 2
28 Jan 2026 S2
21Two 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 the original frequency of tuning fork A is Hz.