A source of sound gives five beats per second when sounded with another source of frequency $100\,{s^{ - 1}}$. The second harmonic of the source together with a source of frequency $205\,{s^{ - 1}}$ gives five beats per second. What is the frequency of the source .... ${s^{ - 1}}$
AIPMT 1995, Medium
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(a) Frequency of the source $ = 100 \pm 5 = 105 Hz\,$ or $ \,95 Hz.$
Second harmonic of the source $= 210 Hz$ or $190 Hz.$
As the second harmonic gives $5$ beats/sec with sound of frequency $205 Hz,$
the second harmonic should be $210 Hz.$
==> Frequency of the source $= 105 Hz.$
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