For photons of energy greater than 1.02 MeV the probability of pair production occurrence _ as the energy increases.
Correct answer: A. Increase.
- A. Increase.
- B. Completely diminishes.
- C. Reduces to half.
- D. Remains unchanged.
Explanation
The requirement for a photon to carry out pair production is a minimum energy level of 1.02 MeV, if the energy level increases the probability that pair production occurs due to that photon increases. The excess energy is converted into the kinetic energy of the electron positron pair.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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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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