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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 (a) 3200 years (b) 4800 years (c) 6400 years (d) 2400 years



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


Grade:10

1 Answers

Aditi Chauhan
askIITians Faculty 396 Points
10 years ago

(a)

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

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