quiz8 - Exam Name_ MULTIPLE CHOICE. Choose the one...

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Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) A laser beam shines vertically upwards. What laser power is needed for this beam to support a flat piece of aluminum foil with mass 15 microgram and diameter equal to that of the beam? (a) assume the aluminum fully reflects the beam. (b) assume the aluminum is pitch black, and fully absorbs all the beam. A) 40W; 80W B) 20W; 40W C) 10W; 20W D) 10W in either case E) 40W in either case 1) 2) Imagine holding a circular disk in a beam of monochromatic light. If diffraction occurs at the edge of the disk, the center of the shadow is: A) darker than the rest of the shadow B) a bright spot C) bright or dark, depends on the wavelength D) bright or dark, depends on the distance to the screen 2) 3) The movie "Patriot Games" has a scene in which CIA agents use spy satellites to identify individuals in a terrorist camp. Suppose that a minimum resolution for distinguishing human
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quiz8 - Exam Name_ MULTIPLE CHOICE. Choose the one...

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