Exam 4 Solution Key - Physics for Scientists and Engineers | PHYS 2210, Exams of Physics

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Seat #: Name: if f PHYSICS 2200 - EXAM #4 - SPRING 2009 1s a. Unpolarized light passes through three polarizing filters. The angle between ea the polarizing directions of the first Io and second filter is 60°. The initial ~~ intensity of the light is 8 x 10°? W/m’, and the final intensity of the light (after the third filter) is 5 x 10°? W/m’. What is the angle between the polarizing directions of the second and third filters? I> 4I. oF = z ! a o T,=L, cos0° = 21, cos 0 z 2 da = [cose = £7, ces ¢otos 6 es 2 (5x17 3 “hn®) -> _ _ {soe - 7. L056 = Feces "bo? (Fxio* Yn Les “60 b. A 5000 W laser beam hae a radius of 4 mm. Find the force due to radiation pressure on a perfectly reflecting mirror if the beam hits laser beam perpendicular to the mirror's muror surface. = power _ sooo 7 Ww I ate 7 0.00m)* = LIFT KI yt So tha force fs or F> PB Xarea > CC * wre Pity 2 =y = Ronse znse? Ym?) 2 F DKF ee * } (0.00¥¢m,) = [33 3x0 ° WM |