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Grade 12th passModern Physics

Help me to solve this question from Radioactivity.Initial active mass of radioactive sample is 76gm. find active mass at the end of 2 mean lives.

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Chandra Sen

9 Years agoGrade 12th pass

1 Answer

Vikas TU

9 Years ago

Already answered!!

plz do check your previous qstn.

Reposting:

At 2 t-half lives the amount would be reduced to the one – fourth of the inital mass.

As from the n series,

t1/2 = w/2^n here n =2

Hence,

the active mass at this end is here: => 76/4 => 19 gms

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