1. The U.S. Navy has long proposed the construction of extremelylow-frequency (ELF waves) communications systems; such waves couldpenetrate the oceans to reach distant submarines.
Calculate the length of a quarter-wavelength antenna for atransmitter generating ELF waves of frequency 91 Hz.
km =
2. What are the wavelength ranges for the following?
(a) the AM radio band (540-1600 kHz)
m (maximum wavelength)
m (minimum wavelength)
(b) the the FM radio band (88-108 MHz)
m (maximum wavelength)
m (minimum wavelength)
3. The angle of incidence of a light beam in air onto areflecting surface is continuously variable. The reflected ray isfound to be completely polarized when the angle of incidence is57.0
