NEET2012PhysicsNuclear PhysicsActual
A mixture consists of two radioactive materials A₁ and A₂ with half lives of 20 ~s and 10 ~s respectively. Initially the mixture has 40 ~g of A₁ and 160 ~g of A₂ . The amount of the two in the mixture will become equal after
Options
- A60 ~s
- B80 ~s
- C20 ~s
- D40 ~s
Correct answer
D. 40 ~s
Step-by-step solution
For 40 ~g amount 40 ~g half -life 20 ~s 20 ~g 20 ~s 10 ~g For 160 ~g amount array l 160 ~g 10 ~s 80 ~g 10 ~s 40 ~g 40 ~g 10 ~s 20 ~g 10 ~s 10 ~g array So, after 40 ~s A₁ and A₂ remains same.