A photon is________________?
Correct answer: C. A quantum of electromagnetic radiation
- A. A unit of energy
- B. A positively charged particle
- C. A quantum of electromagnetic radiation
- D. A unit of wavelength
Explanation
A photon is the smallest indivisible packet, or quantum, of electromagnetic radiation, with energy E = hf. It is not itself a unit of energy or wavelength, and it has no electric charge. Students may choose a because a photon carries energy, but carrying a quantity does not make it the unit of that quantity.
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About Photons and the Particle Model of Light
The particle model treats light as photons with energy E equals hf and momentum related to wavelength. Questions involve the photoelectric effect, work function, threshold frequency, stopping potential and photon energy, while distinguishing particle behaviour from the wave description of interference and diffraction.
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