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Q.

The half-life period of a radioactive substance is 5 min. The amount of substance decayed in 20 min will be

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a

93.75%

b

75%

c

25%

d

6.25%

answer is A.

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Detailed Solution

Number half-lives in 20 min =n=205=4Fraction of material remains after four half lives =116Hence fraction that decays =1-116=1516=93.75%
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