NEET Physics Nuclei Questions Solved


The radioactivity of a certain radioactive element drops to 1/64 of its initial value in 30 seconds. Its half life is

(a) 2 seconds               (b) 4 seconds
(c) 5 seconds               (d) 6 seconds

(c) N=N012t/TN064=N01230/TT=306=5 sec

Difficulty Level:

  • 6%
  • 22%
  • 64%
  • 11%
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