The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ______________ gm?
Correct answer: B. 1/16
- A. 1/4
- B. 1/16
- C. 1/2
- D. 1/8
Explanation
Four hundred days contain four half-lives of 100 days, so the amount becomes 1 × (1/2)^4 = 1/16 gram. Each half-life halves the quantity remaining, regardless of the starting amount.
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