The name of the photon for quantum of light was proposed by________________?
Correct answer: D. Einstein
- A. Ampere
- B. Plank
- C. Thomson
- D. Einstein
Explanation
Einstein introduced the term photon for a quantum, or packet, of electromagnetic radiation while explaining the photoelectric effect. Planck proposed energy quantization but did not introduce the name photon. Students may choose Planck because of his quantum hypothesis, confusing the origin of quantization with the naming of the light quantum.
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About Quantum Theory and Radiation
Quantum theory treats electromagnetic radiation as packets of energy called photons, with energy proportional to frequency through E equals hf. The topic covers Planck's hypothesis, photon momentum, the photoelectric effect, threshold frequency, work function and wave particle duality, distinguishing quantised energy exchange from classical continuous radiation.
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