NEET Physics Nuclei Questions Solved

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After two hours, one- sixteenth of the starting amount of a certain radioactive isotope remained undecayed. The half life of the isotope is

(a) 15 minutes                 (b) 30 minutes
(c) 45 minutes                 (d) 1 hour

(b) NN0=12t/T116=122/T124=122/T

 T = 0.5 hour = 30 minutes

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