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The fraction of the original number of nuclei of a radioactive atom having a mean life of 10 days, that decays during the 5th day is

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The fraction of the original number of nuclei of a radioactive atom having a mean life of 10 days, that decays during the 5th day is 

(A)   0.15 

(B)   0.30 

(C)  0.045

(D)  0.064

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Correct option  (D) 0.064 

Explanation:

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