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Question

During the mean life of a radioactive element, the fraction that disintegrates is-

A
1e
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B
ee1
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C
e1e
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D
ee1
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Solution

The correct option is C e1e
The mean lifetime , t=1λ

Fraction that disintegrates is,

N0NtN0=N0N0eλtN0

=1eλ×1λ

=11e

=e1e

Hence, (C) is the correct answer.

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