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# 20% of a radioactive element disintegrates in 1hr.The percentage of the radioactive element disintegrated in 2hrs will be36%60%64%40%

A
36%
B
64%
C
60%
D
40%
Solution
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#### Let initially the number of radioactive particles be 100.Using the formula:N=N0e−λt where λ=2.303tlog(N0N)

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