The X-ray photon is uncertain when it is
Correct answer: D. All of these
- A. Emitted
- B. Absorbed
- C. Travelling
- D. All of these
Explanation
Since an X-ray photon has a large momentum (by the de Broglie relation), its uncertainty in momentum is low, but the uncertainty of position is very high by Heisenberg's uncertainty principle. Hence at all times, we are uncertain of its position in space.
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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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