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OpenStudy (anonymous):
The half-life of radium-226 is 1620 years. How much of one gram of radium-226 will remain unchanged after four half-lives? a) 0.125 g b) 0.50 g c) 0.0625 g d) 0.25 g
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OpenStudy (anonymous):
C
OpenStudy (anonymous):
THANKS!
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