MHT CET 2025 21st April Evening Shift | Atoms and Nuclei Question 6 | Physics

Using Bohr's quantization condition, the rotational kinetic energy in the third orbit for a diatomic molecule is ( $h=$ Planck's constant, $\mathrm{I}=$ moment of inertia of diatomic molecule)

$\frac{9 h^2}{8 \pi^2 I}$

$\frac{3 \mathrm{~h}^2}{8 \pi^2 \mathrm{I}}$

$\frac{6 h^2}{8 \pi I}$

$\frac{12 h^2}{7 \pi^2 I}$

MHT CET 2025 21st April Morning Shift

MCQ (Single Correct Answer)

-0

Which of the following transitions in hydrogen atom emit photons of highest frequency? ( $\mathrm{n}=$ principle quantum number)

$\mathrm{n}=1$ to $\mathrm{n}=3$

$\mathrm{n}=2$ to $\mathrm{n}=4$

$\mathrm{n}=5$ to $\mathrm{n}=3$

$\mathrm{n}=2$ to $\mathrm{n}=1$

MHT CET 2025 21st April Morning Shift

MCQ (Single Correct Answer)

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Two radioactive materials $A$ and $B$ having decay constant ' $7 \lambda$ ' and ' $\lambda$ ' respectively, initially have same number of nuclei. The time taken to have the ratio of number of nuclei of material B to that of A as ' e ' is

$\frac{1}{\lambda}$

$\frac{1}{6 \lambda}$

$\frac{1}{7 \lambda}$

$\frac{1}{8 \lambda}$

MHT CET 2025 20th April Evening Shift

MCQ (Single Correct Answer)

-0

The ratio of angular momentum of an electron in $\mathrm{n}^{\text {th }}$ orbit of hydrogen atom to the velocity of electron in $\mathrm{n}^{\text {th }}$ orbit is proportional to

$\mathrm{n}^2$

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

$\mathrm{n}^3$

$\frac{1}{\mathrm{n}^3}$

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