Question: A small helium-neon laser emits redvisiblelightwith a powerof 3.20mW in a beam that has a diameter of 2.50mm.
(a) What are the amplitude of the electricand magneticfields of the light?
(b) What are the average energydensities associated with the electric field and with the magnetic field?
(c) What is the total energy contained in a 1.00m length of the beam?
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Power of laser light (P) = 3.20 mW = 3.2*10^(-3) W
diameter (d) = 2.5 mm
=> radius (r) = 1.25 mm = 1.25*10^(-3)m
Area of cross section (=A) = pi*r^2 = pi*(1.25*10^(-3))^2 = 4.9*10^(-6) m^2
Hence intensity …
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