CUET · PHYSICS · PYQ PAPER 2023
The wavelength of the first spectral line of an element is 5893 Å. The first excitation energy is :
- A 2.1 eV
- B 4.2 eV
- C 6.3 eV
- D 8.4 eV
Answer & Solution
Correct Answer
(A) 2.1 eV
Step-by-step Solution
Detailed explanation
\(E = \frac{hc}{\lambda}\) \(E = \frac{(6.626 \times 10^{-34} \text{ J s}) \times (3 \times 10^8 \text{ m/s})}{5893 \times 10^{-10} \text{ m}}\) \(E = 3.373 \times 10^{-19} \text{ J}\) \(E_{eV} = \frac{3.373 \times 10^{-19} \text{ J}}{1.602 \times 10^{-19} \text{ J/eV}}\)…
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