l Help Ch. 22 Homework, pt. 2 Begin Date: 10/16/2017 2:00:00 PM- Due Date: 10/18

Question

l Help Ch. 22 Homework, pt. 2 Begin Date: 10/16/2017 2:00:00 PM- Due Date: 10/18/2017 5:00:00 PM End Date: 10/20/2017 9:59:00 AM (25%) Problem. 3: An AM radio transmitter broadcasts 35 kw of power uniformly in all directions. Randomized Variables P 35 kW d=21km 50% Part (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 2/ km away? Grade Summary Deductions Potential 100 0% sinO cos07 8 9 cotan0 asin0acos0 atan0 acotan0sinh0 cosh tanh cotanho Submissions Attempts remaining: 6 (4% per attempt) detailed view ODegrees O Radians vo Submit Hint I give up! Hints, 1% deduction per hint. Hints remaining: 2 Feedback: deduction per feedback. 50% Part (b) what is the maximum electric field strength at this distance, in NC? An comes © 2017 Expert TALLC

Explanation / Answer

(A) I = P / 4 pi r^2

I = (35 x 10^3) / (4 x pi x (21 x 10^3)^2)

I = 6.32 x 10^-6 W/m^2

(B) I = E^2 / u0 c

6.32 x 10^-6 =E^2 / (4 xpi x 10^-7 x 3 x 10^8)

E = 0.049 N/C

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