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  • A and are two substances undergoing radioactive decay in a container. The half life of A is 15 min and that of B is 5 min. If the initial concentration of B is 4 times that of A and they both start

A and are two substances undergoing radioactive decay in a container. The half life of A is 15 min and that of B is 5 min. If the initial concentration of B is 4 times that of A and they both start decaying at the same time, how much time will it take for the concentration of both of them to be same?_____min.

Option: 1

15


Option: 2

-


Option: 3

-


Option: 4

-


Answers (1)

best_answer

Condition       \Rightarrow[\mathrm{B}]=4[\mathrm{~A}]
For A            \mathrm{A} \underset{15 \min }{\stackrel{\mathrm{t} 1 / 2}{\longrightarrow}} \frac{\mathrm{A}}{2}
For B           \quad 4 \mathrm{~A} \underset{\frac{t}{15} \mathrm{~min}}{\longrightarrow} 2 \mathrm{~A} \frac{\mathrm{t}_{1 / 2}}{5 \mathrm{~min}} \quad \mathrm{~A} \frac{\mathrm{t} / 2}{5 \mathrm{~min}} \mathrm{~A} / 2

Posted by

Rakesh

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