A source of light, spreading out radially from a point source, produces a sinuso

Question

A source of light, spreading out radially from a point source, produces a sinusoidal electric field of amplitude 6.88 V/m at a radial distance of 42.0 m from the source. We want to determine the power output front the source. First write an equation relating the average energy flow rate (I) to the maximum value of I for a traveling electromagnetic wave. Write an equation relating the total power radiating out from a source (spherically symmetrical) to the intensity i a: a radial distance r front the source. This equation is not on the Study Guide sheet. Think about the fact that intensity is power-flux per unit area and consider the total area of a surface that has intensity equal to the point under consideration. What is the source s power output? What is the magnetic field amplitude at twice the radial distance. X4.0 m?

Explanation / Answer

A source of light, spreading out radially from a point source, produces a sinuso

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