An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower
The electric field amplitude of the signal at that point is 0.63 V/m. Assume that the signal power is radiated uniformly in all directions and that radio waves incident upon the ground are completely absorbed. What is the magnetic field amplitude of the signal at that point? (c = 3.0 x 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
A) 2.9 nT B) 1.7 nT C) 1.3 nT D) 2.1 nT E) 2.5 nT
D
You might also like to view...
In what spectral range are black lights that cause materials to fluoresce in the visible?
A. x-ray B. infrared C. ultraviolet D. radio E. microwave
A common property of _________metals is their high melting temperature.
Fill in the blank(s) with the appropriate word(s).
Neon atoms in a glass tube can be excited
A) once per atom. B) repeatedly. C) by infrared light.
Who was the first person to realize that the planets move in elliptical paths around the sun?
A) Kepler B) Copernicus C) Brahe D) Einstein E) Galileo