As a result of annihilation of electron and positron, number of γ-ray (Gama ray) photons are: ________?
Correct answer: A. Two
- A. Two
- B. Three
- C. Four
- D. One
Explanation
When an electron and positron annihilate at rest, their rest energy is converted into two gamma-ray photons moving in opposite directions so that momentum is conserved. Students may choose one photon by applying only energy conservation and overlooking the need to conserve momentum.
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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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