Asmall laser emits light at a power of 5.00 mw. the laser beam is focussed until its diameter matches the 1266 nm diameter of a sphere placed in its path. the sphere is perfectly absorbing and has a density of 5.00 x10 3 kg/m 3.
a. calculate the average energy per unit time per unit area (s). b. find the maximum values of e and b. c. calculate the radiation pressure on the sphere and the force exerted on the sphere. d. find the acceleration of the sphere.

A). The half of the sphere facing the beam has surface area of

                     2 (pi) (R²)

                 = (2 pi) (633 x 10⁻⁹ m)²

                 = (2 pi) (4.01 x 10⁻¹³) m²

                 =      2.52 x 10⁻¹² m²

Average power =  (5 x 10⁻³ W) / (2.52 x 10⁻¹² m²)

                           =  1.984 GW / m²  .

b).
c).
d).  I don't remember how to do these parts of the question.
However, I do sincerely believe that the solution of part-'a' was
a fair return for the penurious and parsimonious award of 5-points.

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