The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250...

Question

Question

The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0.250 mW.

(a) If such a laser beam is projected onto a circular spot 3.96 mm in diameter, what is its intensity?

W/m²

(b) Find the peak electric field strength.

V/m

(c) Find the peak magnetic field strength.

Answer 1

Answer #1

Intensity = Power / Area = 20.29 W/m²

I= c\epsilon_o E²/2 ==> E = 123.65 N/C

B=E/c = 4.12 x 10^-7 Tesla

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Answer 2

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