One of two identical tuning forks with natural frequency 256Hz, one is loaded so that...

JAMB 1984

One of two identical tuning forks with natural frequency 256Hz, one is loaded so that 4 beats per second are heard when they are sounded together. What is the frequency of the loaded tuning fork?

A. 260Hz
B. 252Hz
C. 248Hz
D. 264Hz
E. 258Hz

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Correct Answer: Option B

Explanation

- When a tuning fork is loaded with wax, the frequency of the tuning fork decreases, I.e when the prongs are loaded, their inertia increases, resulting in decrease of vibrational frequency.

Beat = F2 - F1

4 = 256 - F1

F1 = 252Hz

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