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An 80-MW Laser Beam Emits a Cylindrical Beam of Single-Wavelength Sinusoidal

Question 1

Multiple Choice

An 8.0-mW laser beam emits a cylindrical beam of single-wavelength sinusoidal light 0.90 mm in diameter.What is the rms value of the electric field in this laser beam? (ε0 = 8.85 × 10-12 C2/N ∙ m2,μ0 = 4π × 10-7 T ∙ m/A,c = 3.0 × 108 m/s)


A) 2200 N/C
B) 1000 N/C
C) 1100 N/C
D) 4100 N/C
E) 2000 N/C

Correct Answer:

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