Atoms And Nuclei Question 411

Question: The ratio of half-life times of two elements A and B is $ \frac{T_{A}}{T_{B}} $ . The ratio of respective decay constant $ \frac{{\lambda_{A}}}{{\lambda_{B}}}, $ is

Options:

A) $ T_{B}/T_{A} $

B) $ T_{A}/T_{B} $

C) $ \frac{T_{A}+T_{B}}{T_{A}} $

D) $ \frac{T_{A}-T_{B}}{T_{A}} $

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Answer:

Correct Answer: A

Solution:

  • $ {T_{1/2}}=\frac{In2}{\lambda }\therefore \lambda =\frac{In2}{{T_{1/2}}} $
    $ \Rightarrow {\lambda_{A}}=\frac{In2}{T_{A}},{\lambda_{B}}=\frac{In2}{T_{B}}\Rightarrow \frac{{\lambda_{A}}}{{\lambda_{B}}}=\frac{T_{B}}{T_{A}}. $


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