GATE Half-Life PROBLRMS
GATE 2013 Q.16 If a radioactive isotope has a decay constant of 1.55 × 10-10 year-1, its half-life (in years) would be (A) 4.57 × 109 (B) 4.47 × 109 (C) 4.57 × 1010 (D) 4.47 × 1010 GATE 2015 Q.20 The pair of curves that depicts the radioactive decay and growth of a parent-daughter pair in the following figure is (N – Number of nuclides, Time in multiples of half-life). (A) P, Q (C) P, S (B) P, R (D) S, Q GATE 2016 Q.10 Which one of the following parent-daughter systems has the longest half life? (A) 147Sm → 143Nd (B) 40K → 40Ar (C) 87Rb → 87Sr (D) 187Os → 187Re GATE 2016 Q.52 The fraction of a radioactive nuclide remaining after 10 half-lives is closest to (A) 0.1 (B) 0.01 (C) 0.001 (D) 0.0001 GATE 2013 Q.16 If a radioactive isotope has a decay constant of 1.55 × 10-10 year-1, its half-life (in years) would be (A) 4.57 × 109 (B) 4.47 × 109 (C) 4.57 × 1010 (D) 4.47 × 1010 GATE 2018 Q.80 The ratio of the number of daughter nuclides to the number of ...
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