A given signal's second harmonic is twice the given signal's __________ frequency?

A. Fourier

B. Foundation

C. Fundamental

D. Field

Answer: Option C

Solution(By Examveda Team)

A given signal's second harmonic is twice the given signal's fundamental frequency. Harmonics are generated when there are non-linearities in an amplifier (there are always non-linearities). The worse the non-linearities, the more harmonics. A signal at 27.5 MHz (approximate frequency for US citizen's band) would have a second harmonic at 55.0 MHz (on US channel 2!). Can you see why there might be problems? A CB operator might do well to place a low-pass filter on his radio.