NEET Physics Nuclei Questions Solved

A sample of radioactive elements contains 4 x 1010 active nuclei. If half-life of element is 10 days, then the number of decayed nuclei after 30 days is (a) 05 x 1010 (b) 2 x 1010 (c) 3.5 x 1010 (d) 1 x 1010 [2002]
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