Electromagnetic radiation from a lamp

  • #1

Homework Statement



What is the peak electric field E_0 at 1 m from a 100 W lamp. Assume spherically uniform emission

Homework Equations



Magnitude of Poynting vector [tex] S = \frac{E_0^2}{c\mu_0} [/tex]
And Power = S x Area (2)

The Attempt at a Solution



Sub for S from (1) in (2) and rearranging: [tex] E_0 = \sqrt{\frac{cP\mu_0}{A}} [/tex]

is A just then [tex] 4\pi d^2 [/tex] where d = 1m?

Then after that just plugging in numbers?
 

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