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A sample has 4 x 106 radioactive nuclei of half life 10 days. The number of atoms decaying in 30 days is (a) 3.9

A sample has 4 x 106 radioactive nuclei of half life 10 days. The number of atoms decaying in 30 days is (a) 3.9 x 106 (c) 106 (b) 5 x 105 (d) 3.5 106

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