Correct Answer - Option 3 : 12.3 keV
Concept:
Photon: A photon is a tiny light particle that comprises waves of electromagnetic radiation.
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James Maxwell observed photons are just electric fields traveling through space.
- Photons have no charge and no resting mass.
- It travels at the speed of light.
The energy of Photon is given by:
E = h ν
In terms of wavelength, it is given by
\(E = \frac {hc}{λ}\)
Where h is Planck's constant, and ν is the frequency of the Electromagnetic wave associated with the photon, λ is the wavelength of the light.
h = 6.626 × 10-34 m2 kg/s;
Calculation:
Given λ = 5890 A° = 5890 × 10-10 m, c = 3 × 108 m/s;
The energy of the photon will be
\(E = \frac {6.626 × 10^{-34}× 3 × 10^8}{1 × 10^{-10}}\)
⇒ E = 1.987 × 10-15 J;
We have 1 eV = 1.602 × 10-19 J;
⇒ E = 12.4 keV.
