Nuclei - Result Question 78

79. The half life of radium is about 1600 years. Of 100g of radium existing now, 25g 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:

  1. (a) 100g will become 25g in two half lives, so, it is 3200 years.


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