Q.

In a radioactive sample, what fraction of the initial number of radio active nuclei will be decayed after a time t=T2 , where T=half life of radio active substance?

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a

(2−1)

b

122

c

12

d

2−12

answer is D.

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Detailed Solution

NN0=1(2)t/T=1(2)T/2T=12Fraction of sample decayed=No−NNo = 1−NNo = 1−12 = 2 −12
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