Radioactivity - 2) This experiment illustrates radioactive...

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Radioactivity July 21, 2009 Exploration: Radioactive Decay Investigation a) b) It took about 2 trials for roughly half of the pennies to decay. c) The curve approximates an exponential decay. d) The number of undecayed nuclei falls to roughly ¼ its initial value after 2 half-lives, and  then to roughly 1/8 its initial value after 3 half-lives. e) The half-life measurement is pretty accurate. a) b-c) d) Based on my graph, about 2 trials were necessary for roughly half the pennies to decay. e) The curve approximates an exponential decay. f) The number of undecayed nuclei falls to roughly ¼ its initial value after 2 half-lives, and then  to roughly 1/8 its initial value after 3 half-lives. g) The half-life measurement is very accurate. 1) It is more accurate to measure the half-life with a larger sample.
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Unformatted text preview: 2) This experiment illustrates radioactive decay in that the curve approximates an exponential decay. The number of undecayed nuclei falls to roughly ¼ its initial value after 2 half-lives, and then to roughly 1/8 its initial value after 3 half-lives, etc. Board Questions 1) I predict that there must be 7 tosses before there are no heads left. 2) Qualitatively, if you used a 6-sided dice and if a toss of a “5” meant an atom decayed… a. The percent probability that any given toss would yield a decayed atom is about 17%. b. To have a chance that 100 “radioactive” dice would have decayed, 25 tosses would be needed. Every time you roll the dice, most likely, 5/6 of them will not have a 5 on it....
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This note was uploaded on 08/30/2011 for the course PHYS 10 taught by Professor Vaughn during the Summer '09 term at West Valley.

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