jee-main 2021 Q19

jee-main · India · session4_27aug_shift1 Not Maths

There are $10^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is 1 min. How many nuclei will remain after $30\mathrm{~s}$? $(\sqrt{2} = 1.414)$
(1) $7 \times 10^{9}$
(2) $10^{5}$
(3) $2 \times 10^{10}$
(4) $4 \times 10^{10}$

There are $10^{10}$ radioactive nuclei in a given radioactive element. Its half-life time is 1 min. How many nuclei will remain after $30\mathrm{~s}$? $(\sqrt{2} = 1.414)$\\
(1) $7 \times 10^{9}$\\
(2) $10^{5}$\\
(3) $2 \times 10^{10}$\\
(4) $4 \times 10^{10}$

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