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A nucleus of Ux1 has a half life of 24.1...

A nucleus of `Ux_1` has a half life of 24.1 days. How long a sample of `Ux_1` will take to change to 90% of `Ux_1`.

A

80 days

B

40 days

C

20 days

D

10 days

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The correct Answer is:
A
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