મિશ્રણમાં બે રેડિયોએકટિવ તત્વ A અને B ના અર્ | vedclass

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Question

Let after $t\,s$ amount of the $A_{1}$ and $A_{2}$ will become equal in the mixture.

As $N=N_{0}\left(\frac{1}{2}\right)^{n}$

where $n$ is the n

Vedclass · Accepted Answer

$40$

Vedclass · Answer

Let after $t\,s$ amount of the $A_{1}$ and $A_{2}$ will become equal in the mixture.

As $N=N_{0}\left(\frac{1}{2}ight)^{n}$

where $n$ is the number of half-lives

For $A_{1}, N_{1}=N_{01}\left(\frac{1}{2}ight)^{t / 20}$

For $A_{2}, N_{2}=N_{02}\left(\frac{1}{2}ight)^{t / 10}$

According to question, $N_{1}=N_{2}$

${\frac{40}{2^{t / 20}}=\frac{160}{2^{t / 10}}}$

${2^{t/10}} = 4\left( {{2^{t/20}}} ight)$ or ${2^{t/10}} = {2^2}{2^{t/20}}$ $ \Rightarrow {2^{t/10}} = {2^{\left( {\frac{t}{{20}} + 2} ight)}}$

${\frac{t}{10}=\frac{t}{20}+2 	ext { or } \frac{t}{10}-\frac{t}{20}=2}$

or $\quad \frac{t}{20}=2 \quad$ or $\quad t=40 \mathrm{\,s}$

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