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A 12.0-mW helium–neon laser emits a beam of circular cross section with a diameter of 2.35...

A 12.0-mW helium–neon laser emits a beam of circular cross section with a diameter of 2.35 mm.

(a) Find the maximum electric field in the beam.
kN/C

(b) What total energy is contained in a 1.00-m length of the beam?
pJ

(c) Find the momentum carried by a 1.00-m length of the beam.
kg · m/s

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