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Half lives of two radioactive nuclei A a...

Half lives of two radioactive nuclei A and B are 10 minutes and 20 minutes, respectively. If, initially a sample has equal number of nuclei, then after 60 minutes, the ratio of decayed numbers of nuclei A and B will be:

A

`1:8`

B

`3:8`

C

`9:8`

D

`8:1`

Text Solution

Verified by Experts

The correct Answer is:
C
`N_(1) = N_(0)(1/2)^(6) , N_(2) = N_(0)(1/2)^(3)`
`rArr (N_(0)-N_(1))/(N_(0)-N_(2)) =9/8` .
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