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Frequency of first source with 5 beats/sec = 100 Hz and frequency of second source with 5 beats/sec = 205 Hz. What is the frequency of the second harmonic of the source?

1. 210 Hz
2. 190 Hz
3. 105 Hz
4. 95 Hz

Correct answer: 210 Hz

Solution

The second harmonic of a source is twice its fundamental frequency. The second source has a fundamental frequency of 105 Hz (as it produces 5 beats/sec with 100 Hz). Thus, its second harmonic is 2 × 105 Hz = 210 Hz.

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