Sample 1Medium
A tuning fork of frequency 256 Hz produces 4 beats per second with another fork B. When B is loaded with a little wax, the beat frequency falls to 2 per second. The original frequency of B was
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The answer is B.
B is 256 ± 4 Hz. Wax lowers B's frequency; the beats fall only if B was above 256 Hz, so B = 260 Hz.
- A.
If B were 252 Hz, loading would lower it further and the beats would increase.
- C.
258 Hz would give 2 beats per second before loading, not 4.
- D.
254 Hz would give 2 beats per second before loading, not 4.
NCERT: Class 11 Physics, Chapter 14, Beats