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प्रश्न
During a negative beta decay,
पर्याय
an atomic electron is ejected
an electron which is already present within the nucleus is ejected
a neutron in the nucleus decays emitting an electron
a proton in the nucleus decays emitting an electron.
उत्तर
a neutron in the nucleus decays emitting an electron
Negative beta decay is given as
`n → p + e^(-) + barnu`
Neutron decays to produce proton, electron and anti-neutrino.
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संबंधित प्रश्न
For the `beta^+` (positron) emission from a nucleus, there is another competing process known as electron capture (electron from an inner orbit, say, the K−shell, is captured by the nucleus and a neutrino is emitted).
\[\ce{e+ + ^A_Z X -> ^A_{Z - 1}Y + \text{v}}\]
Show that if `beta^+` emission is energetically allowed, electron capture is necessarily allowed but not vice−versa.
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\[\ce{^2_1H + ^3_1H -> ^4_2He + n}\]
Calculate the energy released in MeV in this reaction from the data:
`"m"(""_1^2"H")`= 2.014102 u
`"m"(""_1^3"H")`= 3.016049 u
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\[\ce{^2_1H + ^3_1H -> ^4_2He}\]
Consider the radius of both deuterium and tritium to be approximately 2.0 fm. What is the kinetic energy needed to overcome the coulomb repulsion between the two nuclei? To what temperature must the gas be heated to initiate the reaction? (Hint: Kinetic energy required for one fusion event =average thermal kinetic energy available with the interacting particles = 2(3kT/2); k = Boltzman’s constant, T = absolute temperature.)
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(Use Mass of proton mp = 1.007276 u, Mass of `""_1^1"H"` atom = 1.007825 u, Mass of neutron mn = 1.008665 u, Mass of electron = 0.0005486 u ≈ 511 keV/c2,1 u = 931 MeV/c2.)
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(a) `"" _88^226Ra → alpha+`
(b) `""_8^19O → _9^19F+`
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A free neutron decays into ______.
