The phenomenon in which electron and positron are converted into two photons, is called:
Correct answer: C. Annihilation of matter
- A. Pair production
- B. Compton effect
- C. Annihilation of matter
- D. photoelectric effect
Explanation
A.The creation of an elementary particle and its antiparticle, usually when a photon (or another neutral boson) interacts with a nucleus an electron and its antiparticle, the positron, may be created is called pair production B. The scattering of high frequency photon strikes a stationary electron the frequency of the photon is decreased after the collision. This phenomenon is referred to as Compton's effect. C. When an electron(e-) and a positron(e+) collide two gamma-ray photons are produced and the phenomenon is called pair annihilation D. When light hits the metal surface electrons are emitted, the phenomenon is called the photoelectric effect and the electrons emitted are called photo-electrons.
This question appeared on the ETEA MDCAT 2005 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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