Answer to Question #134927 in Physical Chemistry for harinath

Physical Chemistry

Question #134927

A radioactive element has found to have half life of 20 seconds. how long will it take for it disintegrate 80%.

Expert's answer

t_1/2=20 seconds

Initial =N₀

Final amount left =0.2N₀

ln(N₀/0.2N₀)= (0.693 x t)/20

t=46.44 seconds (Ans.)

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