The half life period of a radioactive element is 140 days. After 560 days the remaining amount of the element would be:
1/2 of the original amount
1/8 of the original amount
1/16 of the original amount
1/4 of the original amount
A
1/8 of the original amount
B
1/4 of the original amount
C
1/16 of the original amount
D
1/2 of the original amount
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Solution
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Nt=No(12)t/t1/2
Nt=No(12)560/140=No(12)4=No(116)
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