NEET Physics Nuclei Questions Solved

The half-life of a sample of a radioactive substance is 1 hour. If 8×1010 atoms are present at t = 0, then the number of atoms decayed in the duration t = 2 hour to t = 4 hour will be
(a) 2×1010          (b) 1.5×1010
(c) Zero               (d) Infinity

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