MHT CET 2026 15th April Morning Shift | Atoms and Nuclei Question 30 | Physics

Two different radioactive elements with half lives $T_1$ and $T_2$ have undecayed atoms $N_1$ and $N_2$ respectively, present at a given instant. The ratio of their activities at this instant is

$\dfrac{N_1 T_1}{N_2 T_2}$

$\dfrac{N_1 T_2}{N_2 T_1}$

$\dfrac{N_1 T_2}{T_1 T_2}$

$\dfrac{T_1 T_2}{N_1 N_2}$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

A radioactive element having half-life 30 min . is undergoing beta decay. The fraction of radioactive element remains undecayed after 90 min . will be

$\frac{1}{2}$

$\frac{1}{4}$

$\frac{1}{8}$

$\frac{1}{16}$

MHT CET 2025 5th May Evening Shift

MCQ (Single Correct Answer)

-0

The ratio of the total energy of the $2^{\text {nd }}$ orbit electron for the hydrogen atom ($^1\mathrm{H}$) to that of a helium ion ($\mathrm{He}^+$) is :

$\frac{1}{2}$

$\frac{1}{4}$

MHT CET 2025 26th April Evening Shift

MCQ (Single Correct Answer)

-0

The magnetic moment of electron due to orbital motion is proportional to ( $\mathrm{n}=$ principal quantum number)

$n^2$

$\frac{1}{n}$

$\frac{1}{\mathrm{n}^2}$

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