What fraction of a radioactive material will get disintegrated in a period of two half-lives 
(a) Whole             (b) Half
(c) One-fourth      (d) Three-fourth

(d) NN0=12n, n = 2NN0=122=14

So disintegrated part = 1-NN0=1-14=34

Difficulty Level:

  • 14%
  • 11%
  • 18%
  • 59%