- 75

- 0

**1. Homework Statement**

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. Homework Equations**

Irradiance = c*ε

_{0}/2 * E

_{0}

^{2}

**3. The Attempt at a Solution**

If I solve for E

_{0}, I end up with: 4.47*10

^{11}V/m

^{2}. 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 E

_{0}. Is this correct?