A laser produces a cylindrical beam of light of wavelength, Physics

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A laser produces a cylindrical beam of light of wavelength

A laser produces a cylindrical beam of light of wavelength 400nm. The average energy in a 2m length of the beam is 5*10^-8J. The cross sectional area of the beam is 4*10^-6.

a) What is the rms value of the electric field in the light?

b) what is the intensity of the beam?

c) What is the average power output of the laser?

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