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# l22q - 1 ISP209s8 Lecture-4-Clicker Question DATA Take the...

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ISP209s8 Lecture -1- Clicker Question Suppose that normal living tuna contains a certain nucleus that has a half-life of 10 years. Once canned the nuclei begin to decay. If we find a can that has half the expected amount of the nucleus, how old is the can? A). We can not tell B). 1 year C ). 10 years D). 20 years E). ½ year

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ISP209s8 Lecture -2- Clicker Question After three half-lives, what fraction of the original material is left? A). 1/2 B ). (1/2)·(1/2)·(1/2) = 1/8 C). (1/2)·(1/2) = 1/4 D). (1/2)·(1/2)·(1/2) ·(1/2)·(1/2)·(1/2) = 1/64 E). 2 3 = 8
ISP209s8 Lecture -3- Clicker Question The equation for fraction remaining is Which letter in the above equation is the number of half-lives? A). A B). B C). C C B A f = = 2

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Unformatted text preview: 1 ISP209s8 Lecture -4-Clicker Question DATA: Take the half-life of 14-C to be 6000 years. If we find a sample of old bone that has (1/16) the normal amount of 14-C found in living bone, how old is the bone? A). 6000 years B). 12,000 years C ). 24,000 years D). (1/16) years E). (1/6000) 4 years ISP209s8 Lecture -5-Clicker Question When rock forms it has almost no 40-Ar in it. However, the radioactive isotope 40-K, which does form in rock, decays to 40-Ar with a half-life of 1.3 billion years. Suppose we find a rock with a ratio of 40-Ar to 40-K of 1:1. How old is the rock? A)0 years B) 1.3 billion years C) 2.6 billion years D) 3.9 billion years E) It is not possible to have that ratio...
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l22q - 1 ISP209s8 Lecture-4-Clicker Question DATA Take the...

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