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Q.

A sample of radioactive substance is found 90% of its initial amount after one day. What o/o of the original sample can be found after 3 days?

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a

81

b

72.9

c

25

d

65.61

answer is B.

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Detailed Solution

Equal fraction decay in equal periods of time, fraction of sample remaining after3 days ⇒(0.9)3=0.729
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