NEET Physics Nuclei Questions Solved

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If 20 gm of a radioactive substance due to radioactive decay reduces to 10 gm in 4 minutes, then in what time 80 gm of the same substance will reduce to 10 gm 
(a) In 8 minutes              (b) In 12 minutes
(c) In 16 minutes             (d) In 20 minutes

(b) 20 gm substance reduces to 10 gm (i.e. becomes half in 4 min. So T1/2 = 4 min . Again

M=M012t/T1/2

10=8012t/418=123=12t/4 t = 12 min.

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