Advertisements
Advertisements
प्रश्न
What is ‘Pair production’?
Answer the following question briefly and to the point:
What is Pair production?
Advertisements
उत्तर १
An electron and a positron are produced when an intense γ-ray photon strikes a heavy material. One of the substance’s nuclei is responsible for absorbing the photon. Pair creation is the term used to describe this process of energy being transformed into mass.
Equation: \[\ce{\underset{(γ-Photon)}{γ} = \underset{(Electron)}{_-1β^0} + \underset{(Positron)}{_+1β^0}}\]
उत्तर २
In a semiconductor, when a covalent bond is broken, the electron comes out, leaving behind a hole (deficiency of electrons). Thus, an electron-hole pair is formed by rupturing a covalent bond.
उत्तर ३
A positron pair from a gamma ray (or radiation) photon passes close to an atomic nucleus.
संबंधित प्रश्न
Name a material which is used in making control rods in a nuclear reactor.
With the help of a suitable example and an equation, explain the term pair production.
Two nuclei have mass numbers in the ratio 1: 2. What is the ratio of their nuclear densities?
Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of `""_86^220"Rn"`.
Given `"m"(""_88^226"Ra")` = 226.02540 u, `"m"(""_86^222 "Rn")` = 222.01750 u,
`"m"(""_86^220 "Rn")`= 220.01137 u, `"m"(""_84^216 "Po")`= 216.00189 u.
The nuclei of isotopes of a given element contain the same number of ______.
A nucleus of mass number A has a radius R such that ______.
Deuteron is a bound state of a neutron and a proton with a binding energy B = 2.2 MeV. A γ-ray of energy E is aimed at a deuteron nucleus to try to break it into a (neutron + proton) such that the n and p move in the direction of the incident γ-ray. If E = B, show that this cannot happen. Hence calculate how much bigger than B must E be for such a process to happen.
The density of nuclear matter is:
1 amu is defined as:
Energy equivalent of 1 amu is:
