FCC Exam Question: 3-11B2

The second harmonic of a 380 kHz frequency is:

A. 2 MHz.
B. 760 kHz.
C. 190 kHz.
D. 144.4 GHz.
Correct Answer: B

Explanation: In radio theory, a harmonic is an integer multiple of a fundamental frequency. The "second harmonic" refers to the fundamental frequency multiplied by two. To find the second harmonic of 380 kHz, you simply multiply: 380 kHz * 2 = 760 kHz. Therefore, 760 kHz (option B) is the correct answer. Option C, 190 kHz, would be the first subharmonic (380 kHz / 2), not a harmonic. Options A (2 MHz) and D (144.4 GHz) are incorrect values that do not represent a harmonic relationship with the given fundamental frequency.

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