Who proposed quantum theory of radiations?
Correct answer: C. Einstein
- A. Faraday
- B. Newton
- C. Einstein
- D. Planck
Explanation
Quantum theory of radiation was significantly developed by Albert Einstein. In 1905, Einstein proposed the idea that light is quantized and consists of discrete packets of energy called "quanta" or photons. This work on the photoelectric effect was a key contribution to the establishment of quantum theory, demonstrating that light behaves as both particles and waves.
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About Dawn of Modern Physics
Classical physics cannot explain blackbody radiation and related observations, leading to Planck’s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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