Tritium has a half life of 12.5 years undergoing beta decay. What fraction of sample of pure tritium will decay in 50 years?
A
34
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B
1516
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C
6364
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D
78
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Solution
The correct option is B1516 t12=12.5yearst=4t12=4×12.5=50years
let initial nucleus be Not12−→N02t12−→N04t12−→N08 ↓t12 N016 ⇒ remaining N016
decayed 15N016