The Intensity of a Laser Beam Is 450 W/m² $\varepsilon$ ₀ = 8

Multiple Choice

The intensity of a laser beam is 450 W/m².What is the rms value of the electric field of this laser beam? (The permittivity of free space $\varepsilon$ ₀ = 8.85 $\times$ 10^-12 C²/N · m² and the permeability of free space µ₀ = 4 $\pi$ $\times$ 10^-7 N/A².)

A) 1.7 $\times$ 10⁵ V/m
B) 5.8 $\times$ 10² V/m
C) 3.4 $\times$ 10⁵ V/m
D) 4.1 $\times$ 10² V/m
E) 1.3 $\times$ 10³ V/m