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Home > Questions & Answers > Chemistry in College Level > Solutions with Answers

Question: The half life period of an isotope is 2 hours. After 6 hours what fraction of the initial quantity of the isotope will be left behind?

Posted by: Somraj on: 11 Nov, 2015

Arpita Kundu

Aparajit Singh Katiyar

Shashank Tewari

4 Answers by Expert Tutors

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Answer

After 1- 50%, after 2- 25%, after 3-

Shashank Tewari, Vadodara

Answer

12.5%

Answer

Nt = No x 1/2^n where,

Nt =amount of radio isotope remaining.

No =original amount of radio isotope. N = no of half lives

let original amount of isotope =1

Nt = 1x1/2^3 = 1x1/8 = 1/8

Aparajit Singh Katiyar, Mumbai

Answer

1/8th

Arpita Kundu, Kolkata

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