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Q.

Tritium has a half life of 12.5Y undergoing beta decay. The fraction of a sample of pure tritium will remain undecayed after 25Y

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a

1/4

b

1/16

c

1/8

d

1/2

answer is B.

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Detailed Solution

$\frac{M}{M_{0}} = \frac{1}{2^{t / T}} = \frac{1}{2^{25 / 12 .5}} = \frac{1}{2^{2}} = \frac{1}{4}$

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