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Homework Help: Optics | Amplitude of Electric Field Given Radiant Flux Density

  1. Feb 2, 2013 #1
    1. The problem statement, all variables and given/known data
    A laser provides pulses of EM radiation in vacuum lasting 7.47* 10-12 s. If the radiant flux
    density is 2.65 * 1020 W/m2, determine the amplitude of the electric field (x *1011) of the beam. Units are required as listed in instructions.

    2. Relevant equations
    Irradiance = c*ε0/2 * E02

    3. The attempt at a solution
    If I solve for E0, I end up with: 4.47*1011 V/m2. My question is that I did not use the time that the question gave me. All I did was plug into the irradiance equation and solve for E0. Is this correct?
  2. jcsd
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