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

question 11

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