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Unformatted text preview: hernandez (ejh742) oldhomework 01 Turner (58120) 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Suppose that you wish to find out how much gasoline is in an underground storage tank. You pour in one gallon of gasoline that contains some halflife radioactive mate rial that causes a Geiger constant to register 28400 counts per minute above background radiation. The next day you remove a gal lon from the underground tank and measure its radioactivity to be 100 counts per minute above background. How much gasoline is in the tank? Correct answer: 284 gallons. Explanation: After mixing, the gallon you withdraw has 100 28400 = 1 284 of the original radioactive par ticles in it, so the withdrawn gallon is 1 284 of the total volume of gasoline in the tank and there are 284 gallons of gasoline in the storage tank. The same method can be used to measure the volume of blood in creatures, including humans. Information about blood flow as well as volume is obtained by injecting radioiso topes such as chromium51 into the blood stream. 002 (part 1 of 2) 10.0 points The mean radius of a planet is 6 . 02 10 6 m, and that of its moon is 1 . 9 10 8 cm. From this data calculate the ratio of the planets surface area to that of its moon. Correct answer: 10 . 0389. Explanation: Let : r planet = 6 . 02 10 6 m and r moon = 1 . 9 10 8 cm = 1 . 9 10 6 m ....
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This note was uploaded on 06/14/2011 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas at Austin.
 Spring '08
 Turner
 Physics, Work

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