In the electron-position pair production, the speed of the electron is:
Correct answer: C. Equals to speed of positron
- A. Zero
- B. Less than speed of positron
- C. Equals to speed of positron
- D. Greater than speed of positron
Explanation
In electron-positron pair production, a photon with energy greater than or equal to 1.02 MeV (the rest mass energy of an electron and a positron) interacts with a nucleus and creates an electron and a positron. The electron and positron are created with equal and opposite momentum, so they must have the same speed.
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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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