MHT CET 2026 20th April Morning Shift | Atoms and Nuclei Question 4 | Physics

An electron in the hydrogen atom jumps from $n^{th}$ energy state to the ground state. The wavelength so emitted illuminates a photosensitive material having work function $2.65$ eV. If the maximum kinetic energy of the emitted photoelectrons is $10.1$ eV, then the value of '$n$' is

$2$

$3$

$4$

$5$

MHT CET 2026 20th April Morning Shift

MCQ (Single Correct Answer)

-0

The angular momentum of an electron in Bohr's hydrogen atom having energy $(-0.544)$ eV is
($h$ = Planck's constant)

$\dfrac{h}{\pi}$

$\dfrac{3h}{\pi}$

$\dfrac{5h}{2\pi}$

$\dfrac{7h}{2\pi}$

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 :

$\frac{1}{2}$

$\frac{1}{4}$

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