The photon energy of light of wavelength 600 nm is closest to
Correct answer: A. 2 eV
- A. 2 eV
- B. 20 eV
- C. 0.2 eV
- D. 200 eV
Explanation
Using the convenient result that photon energy in electron volts is about 1240 divided by the wavelength in nanometres, 1240 over 600 gives roughly 2 eV. Visible photons all lie between about 1.6 and 3.1 eV, which is a useful range to remember as a check. Values of hundreds of electron volts belong to X rays.
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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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