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Sunday, 4 September 2011
Physics GRE - #33
A radioactive nucleus decays, with the activity shown in the plot below. The half-life of the nucleus is:
2 min
7 min
11 min
18 min
23 min
Solution :
Choice 2 is the answer.
The initial activity is 6\cdot 10^3 (yes, 6 since the line marked 10^3 is really 1\cdot 10^3 and you start counting up from there). At 3\cdot 10^3, the time is around 5 to 10 minutes. Thus the only possible answer is choice 2.
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