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MHT CET 2026 (18 Apr, Shift 1) · Beats

Beats question from MHT CET 2026 (18 Apr, Shift 1)

Q2MHT CET 2026 · 18 APR · SHIFT 1Easy

Beats

Two sources of sound are emitting progressive waves $y_1 = 4\sin 708\pi t$ and $y_2 = 3\sin 700\pi t$ . The sources are placed close to each other. The number of beats heard per second and intensity ratio between waxing and wanning are respectively

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Answer: (d)

$f_1 = \frac{708\pi}{2\pi} = 354\text{ Hz}$ , $f_2 = \frac{700\pi}{2\pi} = 350\text{ Hz}$ , so 4 beats/s
$\frac{I_{max}}{I_{min}} = \frac{(A_1 + A_2)^2}{(A_1 - A_2)^2} = \frac{7^2}{1^2} = 49 : 1$
So the answer is (d) $4,\ 49 : 1$ .

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