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Unformatted text preview: just use a number of the right order of magnitude.) Estimate the half life of 226 88 Ra. Problem C: A Geiger counter is used to measure the radioactive decay of a sample of an unstable isotope. If the count rate is 100 per minute at a given time and 90 per minute exactly one week later, what is the half life of the isotope? Problem D: Show that 1 r 2 d dr " r 2 d dr ( r ) r !# = 1 r d 2 dr 2 . No problems from Beiser this week....
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 Spring '08
 Hickman
 mechanics, Mass, Work

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