Class Management Help Ch. 22 Homework, pt. 2 Begin Date: 3/12/2018 2:00:00 PM -

Question

Class Management Help Ch. 22 Homework, pt. 2 Begin Date: 3/12/2018 2:00:00 PM - Due Date: 3/14/2018 5:00:00 PM End Date: 3/16/2018 9:59:00 AM (25%) Problem 3: An AM radio transmitter broadcasts 65 kw of power uniformly in all directions. Randomized Variables P=65 kW d=26 km ee 50% Part (a) Assuming all of the radio waves that strike the ground are completely absorbed, and that there is no absorption by atmosphere or other objects, what is the intensity 26 km away? 50% Part (b) What is the maximum electric field strength at this distance, in N/C? Grade Su Deduction Potential E0 = 57.81 tan) 789 HOME cosO cotan sinacos0 atan acotan sinh0 coshO tanh cotanh0 sinO Submissi Attempts (4% pera detailed 1 2 3 END o Degrees Radians V BACKSPACE DEL CLEAR Submit Hint ILINA AiM I give up! Feedback: 1 % deduction per feedback. Hints: 1% deduction per hint. Hints remaining: 2

Explanation / Answer

(a)

I = P/A

=P/ 4pi r^2

= 65 * 10^3 / 4 pi ( 26 * 10^3 m)^2

= 7.65 * 10^-6 W/m^2

(b)

I = ceo Eo^2/2

Eo = sqrt 2I/ c eo

= sqrt 2(7.65* 10^-6)/ 3 * 10^8 ( 8.85 * 10^-12)

=7.59 * 10^-2 N/C

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