Gamma-ray (š¯¯²) can produce ionization in which of the following way/s?I. It may lose all its energy in a single encounter with the electron of an atom (Photoelectric effect).II. It may lose only a part of its energy in an encounter (Compton effect).III. Very few very high energy š¯¯² ray photons may impinge directly on heavy nuclei, be stopped and annihilated giving rise to electron-positron pairs (The materialization of energy).
Correct answer: E. I, II and III
- A. I only
- B. II only
- C. III only
- D. I and III only
- E. I, II and III
Explanation
Gamma ray photons can interact with matter in all of the ways described above. All three statements mentioned above are correct.Gamma rays (š¯¯²) can produce ionization in the following ways:I. Photoelectric Effect: In this process, a gamma-ray photon interacts with an electron bound to an atom. The gamma-ray transfers all its energy to the electron, causing the electron to be ejected from the atom. This results in the ionization of the atom. The ejected electron is called a photoelectron.II. Compton Effect (Compton Scattering): In this process, a gamma-ray photon collides with an electron in an atom. The gamma-ray transfers only a part of its energy to the electron, changing the direction and energy of both the gamma-ray and the electron. The gamma ray continues its path with reduced energy, and the electron is ejected from the atom, causing ionization.III. Materialization of Energy (Pair Production): For very high-energy gamma-ray photons, when they approach the vicinity of a heavy nucleus, they can spontaneously convert their energy into an electron and a positron (an antimatter counterpart of an electron). The gamma-ray photon ceases to exist, and the newly formed electron-positron pair carries the energy of the original gamma-ray. This process is known as pair production and results in the ionization of the material surrounding the heavy nucleus.So, all three processes (Photoelectric effect, Compton effect, and Pair Production) can lead to ionization by gamma rays. The likelihood of each process occurring depends on the energy of the gamma-ray and the properties of the interacting material.
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Classical physics cannot explain blackbody radiation and related observations, leading to Planckā€™s quantum theory, in which energy is emitted or absorbed in discrete packets. Photons provide the particle model of light, with energy and momentum linked to frequency and wavelength, including the photoelectric effect and its threshold frequency.
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