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Question

The half life period of a radioactive element is 140 days. After 560 days the remaining amount of the element would be:
  1. 1/2 of the original amount
  2. 1/8 of the original amount
  3. 1/16 of the original amount
  4. 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
Solution
Verified by Toppr

Nt=No(12)t/t1/2

Nt=No(12)560/140=No(12)4=No(116)

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