2. Questions Bank
  3. 12th Class
  4. Chemistry
  5. Nuclear Chemistry / नाभिकीय रसायन

12th Class Chemistry Nuclear Chemistry / नाभिकीय रसायन Question Bank Critical Thinking Nuclear chemistry

  • question_answer
    A radioactive sample has a half-life of 1500 years.A sealed tube containing \[1gm\] of the sample will contain after 3000 years        [MNR 1994; UPSEAT 2001, 02]

    A)            \[1gm\] of the sample

    B)            \[0.5gm\] of the sample

    C)            \[0.25gm\] of the sample

    D)            \[0.00gm\] of the sample

    Correct Answer: C

    Solution :

           \[T={{t}_{1/2}}\times n,\,\,\]\\[3000=1500\times \text{n}\] \n = 2                    \ Amount left \[=\frac{1}{{{2}^{2}}}=\frac{1}{4}=0.25g\].


You need to login to perform this action.
You will be redirected in 3 sec spinner