تم الحل ✓
categoryهندسة كهربائية
schoolبكالوريوس
event_available2026-07-13
السؤال
Transcribed Image Text:
(4 points) The FM radio station KAMB broadcasts
from an antenna atop a 210 meter tall radio tower
at a frequency of 75 MHz with a total radiated
power of 45 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:
12
sin²(0)
I
] =
P.
32π
12
where P is the power output, r is the distance
from the top of the tower to the point on the
ground, and is the angle measured from the
tower to r.
h
Ꮎ
TOWER
GROUND
R
Find the distance R from the base of the tower to
the optimum location for taking the radiation
reading.
m
What is the maximum radiation reading from the
ground?
kW
m²
If the city code requires that electromagnetic
radiation be under 200 microwatts per square
meter, is this antenna operating within city code?
Yes or No
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