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Half - lives of two radioactive elements...

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

A

`1:4`

B

`5:4`

C

`1:16`

D

`4:1`

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The correct Answer is:
B
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