Solution Found!
Answer: Cosmic microwave background radiation fills space
Chapter 31, Problem 41GP(choose chapter or problem)
Problem 41GP
Problem
Cosmic microwave background radiation fills space with an average energy density of about 4 x 10-14 J/m3. (a) Find the rms value of the electric field associated with this radiation, (b) How far from a 7.5-kW radio transmitter emitting uniformly in all directions would you find a comparable value?
Questions & Answers
QUESTION:
Problem 41GP
Problem
Cosmic microwave background radiation fills space with an average energy density of about 4 x 10-14 J/m3. (a) Find the rms value of the electric field associated with this radiation, (b) How far from a 7.5-kW radio transmitter emitting uniformly in all directions would you find a comparable value?
ANSWER:
Solution 41GP
Intensity of Electromagnetic Radiation is given by
I = P/(4** r2) where P is the power radiated, r is distance from source, the term
4** r2 represents area.
Intensity can also be given using Electric field
I = ERMS2/c*