54. What frequency range is the high frequency band? A.3 kHz B.3 to 30 MHz C.30 to 300 MHz D.10 GHz
Option B Solution: High frequency (HF) is the ITU designation for the range of radio frequency electromagnetic waves (radio waves) between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
