NEET Physics Nuclei Questions Solved


A radio isotope has a half life of 75 years. The fraction of the atoms of this material that would decay in 150 years will be

(a) 66.6%               (b) 85.5%
(c) 62.5%               (d) 75%

(d) Number of half lives in 150 years  n=15075=2
Fraction of the atom of decayed = 1-12n

=1-122=34=0.75  Percentage decay = 75%

Difficulty Level:

  • 17%
  • 6%
  • 23%
  • 56%
Crack NEET with Online Course - Free Trial (Offer Valid Till August 27, 2019)