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NEET 1995 (AIPMT) · Beats

Beats question from NEET 1995 (AIPMT)

Q76NEET 1995 · AIPMTMedium

Beats

A source of sound gives 5 beats per second, when sounded with another source of frequency $100\text{ second}^{-1}$ . The second harmonic of the source, together with a source of frequency $205\text{ sec}^{-1}$ gives 5 beats per second. What is the frequency of the source?

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Answer: (a)

$n = 100 \pm 5 = 105$ or $95\text{ s}^{-1}$ .
Second harmonic $2n = 210$ or $190\text{ s}^{-1}$ .
With 205: $210 - 205 = 5$ beats (190 gives 15).
So the answer is (a) $105\text{ second}^{-1}$ .

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