When photons are incident on a metal, electrons are emitted. The process is called:
Correct answer: A. Photoelectric effect
- A. Photoelectric effect
- B. Pair production
- C. X-ray production
- D. Gamma ray production
- E. Radioactive capture
Explanation
Photoelectric effect, a phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it.
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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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