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A small helium neon laser emits red visible light with a power if 5.7mW in a...

A small helium neon laser emits red visible light with a power if 5.7mW in a beam that has a diameter if 2.5mm.

a) what is E max?
b) what is B max?
c) what is the avg energy density associated with the electric field?
d) what is the avg energy density assciated with the magnetic field?
e) what js the total energy contained in a 1m length of the beam?
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Answer #1

Use the power and area of the beam to find the intensity. Use the intensity to find the maximum value of electric field and magnetic field as shown below


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