The momentum of photon of frequency f is:
Correct answer: C. hf/c
- A. hc/f
- B. fc/h
- C. hf/c
- D. hfc
Explanation
The momentum of photon of frequency f is: P = hf/c This expression shows that the momentum of a photon is directly proportional to its frequency and inversely proportional to the speed of light. It's worth noting that photons, despite being massless, carry momentum, which is a characteristic of both wave-like and particle-like behavior in the realm of quantum mechanics.
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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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