NEET Physics Nuclei Questions Solved


A radio-isotope has a half- life of 5 years. The fraction of the atoms of this material that would decay in 15 years will be

(a) 1/8              (b) 2/3
(c) 7/8              (d) 5/8

(c) NN0=1215/5=18 Decayed fraction =1-18=78

Difficulty Level:

  • 28%
  • 12%
  • 50%
  • 12%