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quiz9a - Exam 9a Name MULTIPLE CHOICE Choose the one...

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Exam 9a 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) An electric field in an EM wave traveling northeast oscillates up and down. In what direction does the magnetic field oscillate? A) north-south B) up-down C) northeast-southwest D) northwest-southeast E) east-west 2) 3) A lense with a circular aperture of 1cm in diameter is just barely capable of seperating two objects that are 1 degree apart. What's the wavelength of the light from the two objects? A) 1mm B) 10mm C) 100mm D) 1m 3) 4) Polarizeddlight passes through a sequence of two polarizer whose axes of polarization form a 60 degrees angle. The second polarizer has the same polarization as the incoming light before it
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