Nuclei - Result Question 78
79. The half life of radium is about 1600 years. Of $100 g$ of radium existing now, $25 g$ will remain unchanged after
(a) 3200 years
(b) 4800 years
(c) 6400 years
(d) 2400 years
[2004]
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Answer:
Correct Answer: 79. (a)
Solution:
- (a) $100 g$ will become $25 g$ in two half lives, $so$, it is 3200 years.
