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प्रश्न
What is ‘Pair production’?
Answer the following question briefly and to the point:
What is Pair production?
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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
Obtain approximately the ratio of the nuclear radii of the gold isotope `""_97^197 "Au"` and the silver isotope `""_47^197"Ag"`.
Find the Q-value and the kinetic energy of the emitted α-particle in the α-decay of `""_88^226 "Ra"`.
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.
In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are `""_12^24Mg` (23.98504u), `""_12^25 Mg` (24.98584u) and `""_12^26Mg` (25.98259u). The natural abundance of `""_12^24 Mg` is 78.99% by mass. Calculate the abundances of other two isotopes.
With the help of a suitable example and an equation, explain the term pair production.
The mass number of a nucleus is
The mass number of a nucleus is equal to the number of:-
Mass numbers of two nuclei are in the ratio of 4 : 3. Their nuclear densities will be in the ratio of ______.
Which of the following are the constituents of the nucleus?
The volume occupied by an atom is greater than the volume of the nucleus by a factor of about:
Energy equivalent of 1 amu is:
