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0 votes
42.6k views
in Physics by (79.8k points)

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

(a) 4800 years

(b) 6400 years

(c) 2400 years

(d) 3200 years

1 Answer

+1 vote
by (83.4k points)
selected by
 
Best answer

The correct option is (d) 3200 years.

Explanation:

The total time in which radium change to 25 g is 

= 2 x 1600

= 3200 yr.

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