# NEET Physics Nuclei Questions Solved

The half-life of a sample of a radioactive substance is 1 hour. If $8×{10}^{10}$ 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) $2×{10}^{10}$          (b) $1.5×{10}^{10}$
(c) Zero               (d) Infinity

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