MHT CET 2025 5th May Evening Shift | Atoms and Nuclei Question 1 | Physics

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)

$n^2$

$\frac{1}{n}$

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

MHT CET 2025 26th April Evening Shift

MCQ (Single Correct Answer)

-0

The frequencies for series limit of Balmer and Paschen series are ' $\mathrm{V}_1$ ' and ' $\mathrm{V}_3$ ' respectively. If frequency of first line of Balmer series ' $\mathrm{V}_2$ ' then the relation between $V_1, V_2$ and $V_3$ is

$\mathrm{v}_1-\mathrm{v}_3=2 \mathrm{v}_1$

$v_1+v_2=v_3$

$\mathrm{v}_1-\mathrm{v}_2=\mathrm{v}_3$

$v_1+v_3=v_2$

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