Suppose a radioactive substance disintegrates completely in 10 days. Each day it disintegrates at a rate twice the previous day
Suppose a radioactive substance disintegrates completely in 10 days. Each day it disintegrates at a rate twice the previous day, Then, after nine days, the percentage left to be disintegrated is
(a) 10
(b) 25
(c) 20
(d) 50
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The correct option is (d) 50.
Explanation:
If it disintegrates completely in ten days, alter nine days, only half of the substance should remain. Then, on the tenth day, only the entire substance will disintegrate (i.e., 100%) because rate of disintegration on the tenth day will be double that of the 9th day, i.e., double of 50%.
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