COMEDK · Physics · 16. Waves and Sound
A source of sound gives 5 beats per second, when sounded with another source of frequency \(100 \mathrm{~s}^{-1}\). The second harmonic of the source, together with a source of frequency \(205 \mathrm{~s}^{-1}\) gives 5 beats per second. What is frequency of the source?
- A \(95 \mathrm{~s}^{-1}\)
- B \(105 \mathrm{~s}^{-1}\)
- C \(100 \mathrm{~s}^{1}\)
- D \(205 \mathrm{~s}^{-1}\)
Answer & Solution
Correct Answer
(B) \(105 \mathrm{~s}^{-1}\)
Step-by-step Solution
Detailed explanation
Let the frequency of the sound is \(f\). In first case, \(f=100 \pm 5\) \[ =105 \mathrm{~Hz} \text { or } 95 \mathrm{~Hz} \] The frequency of second harmonic \(=2 f\) According to second case.…
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