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MHT CET 2026 (19 Apr, Shift 1) · Beats

Beats question from MHT CET 2026 (19 Apr, Shift 1)

Q10MHT CET 2026 · 19 APR · SHIFT 1Medium

Beats

A tuning fork gives $5$ beats per second with a $33$ cm length of sonometer wire. If the length of the wire is shortened by $1$ cm, the number of beats is still the same. The frequency of the fork is

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Answer: (b)

$f \propto \dfrac{1}{L}$ , so the 33 cm wire is below the fork and the 32 cm wire above it.
$(n - 5) \times 33 = (n + 5) \times 32$
$33n - 165 = 32n + 160 \Rightarrow n = 325\text{ Hz}$
So the answer is (b) 325 Hz.

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