jee-main 2021 Q18

jee-main · India · session3_25jul_shift1 Not Maths

The half-life of ${}^{198}\mathrm{Au}$ is 3 days. If atomic weight of ${}^{198}\mathrm{Au}$ is $198\mathrm{~g~mol}^{-1}$, then the activity of 2 mg of ${}^{198}\mathrm{Au}$ is [in disintegration second${}^{-1}$]:
(1) $2.67 \times 10^{12}$
(2) $6.06 \times 10^{18}$
(3) $32.36 \times 10^{12}$
(4) $16.18 \times 10^{12}$

The half-life of ${}^{198}\mathrm{Au}$ is 3 days. If atomic weight of ${}^{198}\mathrm{Au}$ is $198\mathrm{~g~mol}^{-1}$, then the activity of 2 mg of ${}^{198}\mathrm{Au}$ is [in disintegration second${}^{-1}$]:\\
(1) $2.67 \times 10^{12}$\\
(2) $6.06 \times 10^{18}$\\
(3) $32.36 \times 10^{12}$\\
(4) $16.18 \times 10^{12}$

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