The half life of radium is about 1600 years. Of 100 g of

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The half life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

1. 3200 years
2. 4800 years
3. 6400 years
4. 2400 years

Correct Option: A

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