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finalExamA - 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) You are lying on the bottom of a swimming pool filled 9ft deep with water (n=1.56). What is the diameter of the "hole" at the water surface through which you can see out of the pool? A) 20ft B) 5ft C) 10ft D) 15ft E) 25ft 1) 2) Two organ pipes are tuned to the same fundamental frequency. One of them has two closed ends, the other one has two open ends. What's the ratio of lengths between the two pipes? 2) 3) A laser beam shines vertically upwards. What laser power is needed for this beam to support a flat piece of aluminum foil with diameter equal to that of the beam? (a) assume the aluminum fully reflects the beam and has mass 30microgram. (b) assume the aluminum is pitch black, and fully absorbs all the beam and has a mass of 15 microgram. A) 40W; 80W B) 20W; 40W C) 10W; 20W D) 10W in either case E) 40W in either case 3) 4) A gas is initially at (5Pa, 10cubic meter), and expands to (15Pa, 20 cubic meter). The gas container can sustain pressures ranging from 0.5Pa to 15Pa. What's the maximal amount of work that the gas can do in going from the initial to the final state? Assume that the volume has to remain within the range of 10-20 cubic meters. 4)
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