NEET Physics Nuclei Questions Solved


In a sample of radioactive material, what percentage of the initial number of active nuclei will decay during one mean life 
(a) 69.3%            (b) 63%
(c) 50%               (d) 37%

(b) Number of atoms remains undecayed N=N0e-λt

Number of atoms decayed = N01-e-λt

N01-e-λ×1λ=N01-1e=0.63 N0= 63% of N0

Difficulty Level:

  • 28%
  • 62%
  • 6%
  • 6%
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