Calculate the wave impedances of electromagnetic waves travelling in free-space, polystyrene (8, = 2.7) and alumina (8, = 8.9). Find the time-average power density in each case if the amplitude of the electric field is 100 V.m
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![[Q2]
Calculate the wave impedances of electromagnetic waves travelling in free-space, polystyrene (8, = 2.7)
and alumina (8, = 8.9). Find the time-average power density in each case if the amplitude of the electric
field is 100 V.m!.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fa2c70c3b-72f2-40a1-ba7d-9bb39b46bcd1%2Fab2d2d4e-074d-430c-a49f-75ce410d8a10%2F3vuk0ez_processed.jpeg&w=3840&q=75)
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- The company where you work has obtained and stored five lasers in a supply room. You have been asked to determine the intensity of the electromagnetic radiation produced by each laser. The lasers are marked with specifications, but unfortunately different information is given for each laser: Laser A: power = 2.6 W; diameter of cylindrical beam = 2.6 mm Laser B: amplitude of electric field = 480 V/m Laser C: amplitude of magnetic field = 8.7 x 10-6 T Laser D: diameter of cylindrical beam = 1.8 mm; force on totally reflecting surface = 6.0 x 10-8 N Laser E: average energy density in beam = 3.0 x 10-7 J/m3 Calculate the intensity for each laser, and rank the lasers in order of increasing intensity. Assume that the laser beams have uniform intensity distributions over their cross sections.A radio station operating at 900 kHz frequency uses a monopole antenna. The antenna length (A) if it is equivalent to a dipole with a half wavelength isThe U.S. Navy has long proposed the construction of extremely low frequency (ELF waves) communications systems; such waves could penetrate the oceans to reach distant submarines. Calculate the length of a quarter-wavelength antenna for a transmitter generating ELF waves of frequency 75 Hz. How practical is this antenna?