CUET · PHYSICS · PYQ PAPER 2023
Which of the following atoms/ions have a ground state energy of -54.4 eV ?
- A Hydrogen atom
- B Deuterium atom
- C Singly-ionised helium
- D Doubly-ionised lithium
Answer & Solution
Correct Answer
(C) Singly-ionised helium
Step-by-step Solution
Detailed explanation
\(E_n = -13.6 \frac{Z^2}{n^2} \text{ eV}\) \(-54.4 = -13.6 \frac{Z^2}{1^2}\) \(Z^2 = \frac{-54.4}{-13.6} = 4\) \(Z = 2\) An atom/ion with \(Z=2\) is Singly-ionised helium.
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