2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन

JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    Half-life of a radioactive substance is 120 days. After 480 days, 4 gm will be reduced to   [EAMCET 1993]

    A)                 2             

    B)                 1

    C)                 0.5         

    D)                 0.25

    Correct Answer: D

    Solution :

                    \[n=\frac{480}{120}=4,\,\,N=\frac{{{N}_{o}}}{{{2}^{n}}},N=\frac{4}{{{2}^{4}}}=\frac{4}{16}\] = 0.25 gm.


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