Question

Part A He-Ne lasers are often used in physics demonstrations. They produce light of wavelength 633 nm and a power of 0.900 mW spread over a cylindrical beam 1.00 mm in diameter (although these quantities can vary). What is the intensity of this laser beam? Express your answer in watts per meter squared. O AEP O O ? W/m² Submit Previous Answers Request Answer X Incorrect; Try Again; 4 attempts remaining Part B What is the maximum value of the electric field? Express your answer in volts per meter. YO ALC * * O O ?

Answer 1

use the following formulas where Eo= amplitude of electric field

Answert A as intensity = Power Area = 0.900x10 Tr = 0.900x103 7 (18 15 3 2 = 0.900x10² x 18 xy = 1145.92 W/m² B) Maximum electric field I= ctoto I= 3x108 x 885 Gol = 1145.92x2 =62 3x18x8.85 = 86.32 x108 = 60² = 19, 29x10960