Author Question: An 800-kHz radio signal is detected at a point 4.5 km distant from a transmitter tower. The ... (Read 89 times)

cartlidgeashley · **on:** Jul 29, 2018

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

Question 2

By what primary heat transfer mechanism does the sun warm the earth?

A) convection
B) conduction
C) radiation
D) All of the above processes are equally important in combination.