10 g of radioactive material of half-life 15 year is kept in store for 20 years. The disintegrated material is [Pb. PMT 2002] (a) 12.5 g (c) 6.03 g (b) 10.5 g (d) 4.03 g

Difficulty Level:

  • 15%
  • 23%
  • 36%
  • 28%