IIT JEE , AIEEE Forum - Chemistry , Physical Chemistry

akhil_o

5. Given a sample of Radium-226 having half-life of 4 days. Find the probability, a nucleus disintegrates after

2 half lives.

(A) 1 (B) 1/2

(C) 1.5 (D) 3/4

I got it as D) 3/4

FIITJEE Soln is given below.

Please tell me which 1 is right

Sol. (B)

Disintegration of each nuclei is independent of any factor. Hence, each nuclei has same chance of

disintegration.

computer001

i tend to agree wid d fiitjee ans...

each nucleus is a man 4 itself..:)

it does not depend on other nuclei..

but wat is ur logic???

akhil_o

after 2 half lives 3/4 of the nuclei get disintegrated
so prob=3/4