Question

An AM radio transmitter broadcasts 46.0 kW of power uniformly in
all directions. Assuming all of the radio waves that strike the
ground are completely absorbed, and that there is no absorption by
the atmosphere or other objects, what is the intensity 33.0 km
away? (Hint: Half the power will be spread over the area of a
hemisphere.)

What is the maximum electric field strength at this distance?

Please show your work!

Answer #1

An AM radio transmitter broadcasts 46.0 kW of power uniformly in
all directions.
(a) Assuming all of the radio waves that strike the ground are
completely absorbed, and that there is no absorption by the
atmosphere or other objects, what is the intensity (in W/m2) 28.0
km away? (Hint: Half the power will be spread over the area of a
hemisphere.) W/m2
(b) What is the maximum electric field strength (in V/m) at this
distance? V/m

A radio antenna broadcasts a 1.0 MHz radio wave with 25 kW
power. Assume the radiation is emitted uniformly in all directions.
1) what is the wave's intensity 30 km from the antenna 2) what is
the electric field amplitude at this distance? PLEASE SHOW ALL
WORK

FM radio station KRTH in Los Angeles broadcasts on an assigned
frequency of 101 MHz with a power of 50,000 W.
(a) What is the wavelength of the radio waves produced by this
station?
(b) Estimate the average intensity of the wave at a distance of
44.4 km from the radio transmitting antenna. Assume for the purpose
of this estimate that the antenna radiates equally in all
directions, so that the intensity is constant over a hemisphere
centered on the...

A
150kW radio station broadcasts it’s signal uniformly in all
directions.
Part A. What is the average intensity of its signal at a
distance of 8.55km from the station?
Part B. What is the rms value of the electric field in this
radio wave?
Part C. If a 1.22m receiving antenna is oriented parallel to
the electric field of the radio wave, what rms voltage appears
between its ends?

Suppose a 20-kW radio station emits EM waves uniformly in all
directions.
Part A
How much energy per second crosses a 1.4 m2 area 1 km from the
transmitting antenna?
Express your answer to two significant figures and include the
appropriate units.
Part B
What is the rms magnitude of the
E⃗ field at this point, assuming
the station is operating at full power?
Express your answer to two significant figures and include the
appropriate units.
Part C
What is...

(1) (A) If the power output of a 675 kHz radio station is 53.0
kW, how many photons per second are produced? If the radio waves
are broadcast uniformly in all directions, find the number of
photons per second per square meter at a distance of 130 km. Assume
no reflection from the ground or absorption by the air.
(B)Photoelectrons from a material whose work function is 2.39 eV
are ejected by 477 nm photons. Once ejected, how long does...

The WCCO AM radio transmitter has a power of 48900 W. You
measure the intensity of the signal to be 8×10−6 W/m^2. How far are
you from the tower? (in km)
7.82×101 km
4.41×101 km
8.82×101 km
1.95×106 km
2.21×101 km
If you travel to a location that is 6 times further away from
the tower than in the previous question, what intensity do you
measure? (in W/m^2)
2.88×10-4 W/m2
1.33×10-6 W/m2
5.11×10-7 W/m2
3.64×10-17 W/m2
2.22×10-7 W/m2

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