The fraction of the original number of nuclei of a radioactive atom having a mean life of 10 day...

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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 \( 5^{\text {th }} \) day is :
(A) \( 0.15 \)
(B) \( 0.30 \)
(C) \( 0.045 \)
(D) \( 0.064 \)
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