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Evaluating an Electric Field

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Question: A small helium-neon laser emits red visible light with a power of 3.20mW in a beam that has a diameter of 2.50mm.

(a) What are the amplitude of the electric and magnetic fields of the light?
(b) What are the average energy densities associated with the electric field and with the magnetic field?
(c) What is the total energy contained in a 1.00m length of the beam?

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Power of laser light (P) = 3.20 mW = 3.2*10^(-3) W
diameter (d) = 2.5 mm
=> radius (r) = 1.25 mm = 1.25*10^(-3)m

Area of cross section (=A) = pi*r^2 = pi*(1.25*10^(-3))^2 = 4.9*10^(-6) m^2

Hence intensity ...

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