MHT CET 2026 20th April Morning Shift | Atoms and Nuclei Question 5 | 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)

$n^2$

$\frac{1}{n}$

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

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Some Basic Concepts of Chemistry Atomic Structure States of Matter Thermodynamics Chemical Equilibrium Ionic Equilibrium Liquid Solution Redox Reactions Surface Chemistry Solid State Electrochemistry Chemical Kinetics Nuclear Chemistry

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