RE hw10 - 10 : Please help me answer this question: tem 10 Cosmic microwave back
ID: 1384724 • Letter: R
Question
RE hw10 - 10 : Please help me answer this question:
tem 10 Cosmic microwave background radiation fills all space with an average energy density of 10 J/m. Part A Find the rms value of the electric field associated with this radiation. Express your answer using one significant figure. IVO V/m 0.0000038819 Submit My Answers Give U incorrect; Try Again; 6 attempts remaining Part B How far from a 7.1kW radio transmitter emitting uniformly in all directions would you find a comparable value? Express your answer using two significant figures. r 1.19.10 km. Submit My Answers Give U incorrect; Try Again; 9 attempts remaining Provide Feedback ContinueExplanation / Answer
A. Multiply energy density by c to get average power intensity I(ave).
E(rms) = sqrt(I(ave)*Z0)
B. P = I(ave)*4pi*r^2 ==> r = sqrt(P/(I(ave)*4pi))
Note. Free-space impedance Z0 = sqrt(
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