oldhomework 01-solutions-3 - patel(rmp932 oldhomework 01...

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patel (rmp932) – oldhomework 01 – Turner – (58220) 1 This print-out should have 14 questions. Multiple-choice 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 half-life radioactive mate- rial that causes a Geiger constant to register 42000 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: 420 gallons. Explanation: After mixing, the gallon you withdraw has 100 42000 = 1 420 of the original radioactive par- ticles in it, so the withdrawn gallon is 1 420 of the total volume of gasoline in the tank and there are 420 gallons of gasoline in the storage tank.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 chromium-51 into the blood- stream. 002 (part 1 of 2) 10.0 points The mean radius of a planet is 6 . 05 × 10 6 m, and that of its moon is 1 . 33 × 10 8 cm. From this data calculate the ratio of the planet’s surface area to that of its moon. Correct answer: 20 . 6922. Explanation: Let : r planet = 6 . 05 × 10 6 m and r moon = 1 . 33 × 10 8 cm = 1 . 33 × 10 6 m .
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