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MHT CET 2026 (20 May, Shift 1) · Beats

Beats question from MHT CET 2026 (20 May, Shift 1)

Q9MHT CET 2026 · 20 MAY · SHIFT 1Medium

Beats

There are two wires vibrating with same frequency of $500$ Hz. Tension in one wire is increased by 'x' % so that $5$ beats per second are heard. The value of 'x' in % is

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Answer: (d)

$f \propto \sqrt{T} \Rightarrow \dfrac{\Delta f}{f} = \dfrac{1}{2}\dfrac{\Delta T}{T}$
$\dfrac{\Delta f}{f} = \dfrac{5}{500} = 0.01$
$\dfrac{\Delta T}{T} = 0.02 = 2\%$
So the answer is (d) 2.

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