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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

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105 s-1

205 s-1

95 s-1

100 s-1

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detailed solution

Correct option is A

Frequency of the source = 100 ± 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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