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Q.

For a certain radioactive substance, it is observed that after 4 h, only 6.25% of original sample is left undecayed. Then after a further 4 h, the amount of the original substance left undecayed will be

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a

0.62%

b

2.15%

c

0.39%

d

4.25%

answer is C.

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Detailed Solution

every four hours it becomes 6.25% of originial  so another four hours it will become 6.25 % of 6.25 6.25100×6.25=0.39 %
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