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A laser emits 7.91 × 1018 photons per second in a beam of light that has...

A laser emits 7.91 × 1018 photons per second in a beam of light that has a diameter of 2.82 mm and a wavelength of 514.5 nm. Determine (a) the average electric field strength and (b) the average magnetic field strength for the electromagnetic wave that constitutes the beam.

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