Per11_exercise - Period 11 Exercise Answers E.1 Comparing...

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Period 11 Exercise Answers E.1 Comparing alpha and beta radiation of the same energy, a) alpha is more ionizing and more penetrating. b) alpha is more ionizing and less penetrating. c) alpha is less ionizing and more penetrating. d) alpha is less ionizing and less penetrating. e) alpha and beta have the same ionizing and penetrating ability. E.1 = b
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E.2 In 1990, a radioactive sample was observed to decay at a rate of 800 counts per minute. In 2002, that same sample was observed to decay with a rate of 100 counts per minute. What is the half-life of the material in the sample? a) 2 years b) 4 years c) 6 years d) 8 years e) 12 years Year Count rate 1990 800/min 1994 400/min 1998 200/min 2002 100/min E.2 = b
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E.3 A student measured the radioactive particles given off by a Barium-137 source. In the experiment, the count rate fell from 280 counts per minute to 35 counts per minute in some time interval t. The half- life of Ba-137 is about 2.6 minutes. How long was the time interval t? a)
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This note was uploaded on 06/11/2011 for the course PHYSICS 104 taught by Professor Staff during the Winter '11 term at Ohio State.

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Per11_exercise - Period 11 Exercise Answers E.1 Comparing...

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