How do I solve this?

1.

A microwave communications link consists of two identical antennae. Each antenna works sym- metrically in send or receive mode. a) Assume antenna 1 radiates 1 W/m2 into a beam of circular cross section with a diameter equal to the diameter of the parabolic reector, D = 1 In. Calculate Ewns and Brms for the radiated beam. L =10km b) Assume the parabolic reector falls off antenna 1, which still radiates the same power but now emits this power isotropically, i.e., uniformly in all directions. How much power is received at Station 2? A microwave source and a parabolic reflector produce a parallel beam of 10,000 megahertz radiation 20 cm in diameter. The radiation in the beam is emitted as pulses 10 seconds long, with a total energy of 10 3 joules per pulse. N 20 cm X FIG. 1: (a) During the pulse the waves have an electric field E = Em sin(wt - kx)z with constant amplitude Em. Find w and k. (b) Write an expression for the B field of the wave (magnitude and direction) in terms of Em, w and k. (c) What is the numerical value of the average energy per unit volume inside a pulse