An 8.000-mW laser beam emits a cylindrical beam of light 0.9000 mm in diameter. What is the rms value of the electric field in this beam?
A) 2176 N/C
B) 1000 N/C
C) 1088 N/C
D) 4122 N/C
E) 2000 N/C

Question

Quizplus · Accepted Answer

The rms value of the electric field can be calculated using the formula E_rms = sqrt(2 * P / (c * ε₀ * A)), where P is the power, c is the speed of light, ε₀ is the permittivity of free space, and A is the cross-sectional area of the beam. Substituting the given values, the correct answer is approximately 2176 N/C.

An 8000-MW Laser Beam Emits a Cylindrical Beam of Light 0