AP EAMCET · PHYSICS · Atomic Physics
A hydrogen like atom has one electron revolving round a stationary nucleus. If the energy required to excite the electron from the 2 nd orbital to 3 rd orbit is \(47.2 \mathrm{eV}\), find the atomic number of the given atom.
- A 3
- B 4
- C 5
- D 6
Answer & Solution
Correct Answer
(C) 5
Step-by-step Solution
Detailed explanation
The energy of \(n\)th orbit is given as \(E_n=\frac{-R h C z^2}{n^2}\) For hydrogen atom, \(z=1\) and \(n=1\), hence \(E_1=\frac{-R h C \cdot 1^2}{1^2}=-R h C\) We know that, \(R h C=13.6 \mathrm{eV}\) \(\therefore \quad E_1=-13.6 \mathrm{eV}\) For \(n=2\),…
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