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Question

If Nt=N0eλt, then number of disintegrated atoms between t1 to t2 (t2>t1) will be

A
N0[eλt2eλt1]
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B
N0[eλt2eλt1]
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C
N0[eλt1eλt2]
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D
None
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Solution

The correct option is C N0[eλt1eλt2]
The number of nuclei at time t1,
N1=N0eλt1
The number of nuclei at time t2,
N2=N0eλt2
Hence the number of disintegrated atoms between t1 and t2
= N1N2
= N0[eλt1eλt2]

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