A Laser Beam Has a Wavelength of 633 Nm and a Power

question 35

Essay

A laser beam has a wavelength of 633 nm and a power of 0.500 mW spread uniformly over a circle 1.20 mm in diameter.This beam falls perpendicularly on a perfectly reflecting piece of paper having twice the diameter of the laser beam and a mass of 1.50 mg.(c = 3.00 × 10⁸ m/s,μ₀ = 4π × 10^-7 T ∙ m/A,ε₀ = 8.85 × 10^-12 C²/N ∙ m²)
(a)What are the amplitudes of the electric and magnetic fields in this laser beam?
(b)What acceleration does the laser beam give to the paper?

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