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Question
Write a short note on quantum theory of light.
Solution
- Albert Einstein (1905), endorsing the views of Max Plank (1900), was able to explain photoelectric effect in which light interacts with matter as photons to eject the electrons.
- A photon is a discrete packet of energy. Each photon has energy E of,
E = hv
Where, h is Plank’s constant (h = 6.625 x 10-34J s) and v is the frequency of the electromagnetic wave. - As light has both waves as well as particle nature it is said to have dual nature.
- Thus, it is concluded that light propagates as a wave and interacts with matter as a particle.
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