Question

The FM radio station KAMB broadcasts from an antenna atop a 170 meter tall radio tower at a frequency of 90 MHz with a total radiated power of 40 kilowatts. Neighbors have complained about problems they attribute to excessive radiation from the tower, but the city engineer who measured the radiation level near the base of the tower found it to be well below the accepted standard. You have been hired by the HOA to assess the engineer's report. You know a few things about electromagnetic radiation and therefore conclude that we must find the optimum place on the ground to measure the maximum radiation emitted from the antenna. From your extensive knowledge in physics, you know that the intensity of radiation, I, is given by the formula:

where P is the power output, r is the distance from the top of the tower to the point on the ground, and θ is the angle measured from the tower to r.

(a) Find the distance R from the base of the tower to the optimum location for taking the radiation reading.
Answer: ______  

(b) What is the maximum radiation reading from the ground?
Answer: ______

(c) If the city code requires that electromagnetic radiation be under 200 microwatts per square meter, is this antenna operating within city code?
Answer choices: Yes or No

sin2(O) 12 TOWER GROUND kM ?7m

Answer 1

IS R2 IS R2 IS R1 For max intens di d R IS ナ1-0 Max- γadiation Yead. S R 뷰.in.。. : 4.13, o'w_

But the γada.cton should be undu?oonuunti/mL im cih AnFenna operati