Suppose the maximum safe average intensity of microwaves for human exposure is taken to be 2.00 W/m2. If a radar unit leaks 10.O W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away, rmin must you be to be exposed to an average intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. min = m What is the maximum electric field strength Eo at this distance? The permittivity of free space is €0 = 8.854 x 10-12 C/(N-m²). The speed of light is c = 3.00 x 10° m/s.

Example The normalized radiation intensity of an antenna is defined by U(0) = sin(0), Find the: b. FNBW a. HPBW 270 300 1 240 330 210 180 150 Exam The r F a.

Suppose the maximum safe intensity of microwaves for human exposure is taken to be 1.81 W/m​2​​. If a radar unit leaks 10.0 W of microwaves (other than those sent by its antenna) uniformly in all directions, how far away must you be to be exposed to an intensity considered to be safe? Assume that the power spreads uniformly over the area of a sphere with no complications from absorption or reflection. (Note that early radar units leaked more than modern ones do. This caused identifiable health problems, such as cataracts, for people who worked near them.)

The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW. (a) If such a laser beam is projected onto a circular spot 1.30 mm in diameter, what is its intensity? 1.88e2 W/m2 (b) Find the peak electric field strength. 1.255e-6 What is the relationship between intensity and electric field strength? V/m (c) Find the peak magnetic field strength. 3.765e-6 What is the relationship between electric field strength and magnetic field strength in an electromagnetic wave? T