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If 10% of a radioactive substance decays...

If 10% of a radioactive substance decays in 5 years, then the percentage of substance that will have decayed in 20 year ,will be

A

56 hr

B

3.5 hr

C

14 hr

D

28 hr

Text Solution

Verified by Experts

The correct Answer is:
C
`t_((1)/(2))` = contain for a nucleide
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