Question icon
Grade 10Modern Physics

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

Profile image of Navjyot Kalra
12 Years agoGrade 10
Answers icon

1 Answer

Profile image of Aditi Chauhan
12 Years ago

(a)

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