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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.

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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Grade:12th pass

1 Answers

Vikas TU
14149 Points
7 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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