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During mean life of a redioactive elemen...

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

A

about `(1)/(3)` of substance disintegrates

B

about `(2)/(3)` of the substance disintegrates

C

about `90%` of the substance disintegrates

D

almost all the substance disintegrates

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The correct Answer is:
B
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