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Half-lives of two radioactive elements A...

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes, respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be -

(A) `1 : 16`
(B) `4 : 1`
(C) `1 : 4`
(D) `5 : 4`

A

`1:4`

B

`5:4`

C

`1:16`

D

`4:1`

Text Solution

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The correct Answer is:
B
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