A helium–neon laser, radiating at 632.8 nm, has a power output of 3.0 mW. The beam diverges (spreads) at angle u = 0.17 mrad . (a) What is the intensity of the beam 40 m from the laser? (b) What is the power of a point source providing that intensity at that distance?
A helium–neon laser, radiating at 632.8 nm, has a power output of 3.0 mW. The beam diverges (spreads) at angle u = 0.17 mrad . (a) What is the intensity of the beam 40 m from the laser? (b) What is the power of a point source providing that intensity at that distance?
Chapter16: Electromagnetic Waves
Section: Chapter Questions
Problem 56P: A small helium-neon laser has a power output of 2.5 mW What is the electromagnetic energy in a 1.0-m...
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Question
A helium–neon laser,
at 632.8 nm, has a power output
of 3.0 mW. The beam diverges
(spreads) at angle u = 0.17 mrad
. (a) What is the intensity
of the beam 40 m from the laser? (b)
What is the power of a point source providing that intensity at that
distance?
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