Pair production takes place in the vicinity of a heavy nucleus so that_____________?
Correct answer: D. All of the above
- A. Net energy is conserved
- B. Net charge is conserved
- C. Net momentum is conserved
- D. All of the above
Explanation
In pair production, a high-energy photon becomes an electron and a positron near a heavy nucleus. The nucleus takes recoil momentum, allowing energy and momentum to be conserved, while charge is conserved because the electron and positron have charges -e and +e, giving net charge 0. The likely trap is choosing only one conservation law, such as option c, instead of recognizing that all three apply.
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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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