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The half-life of radium (226) is 1620 years. The time taken to convert 10 grams of radium to 1.25 grams is

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The half-life of radium (226) is 1620 years. The time taken to convert 10 grams of radium to 1.25 grams is
A. 810 years
B. 1620 years
C. 3240 years
D. 4860 years
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Correct Answer - D
`t = (2.303 xx t_(1//2))/(0.693) "log" (N_(0))/(N)`
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