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प्रश्न
During a negative beta decay,
विकल्प
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.
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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.
Consider the D−T reaction (deuterium−tritium fusion)
\[\ce{^2_1H + ^3_1H -> ^4_2He + n}\]
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
Consider the D−T reaction (deuterium−tritium fusion)
\[\ce{^2_1H + ^3_1H -> ^4_2He}\]
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.)
Obtain the maximum kinetic energy of β-particles, and the radiation frequencies of γdecays in the decay scheme shown in Fig. 13.6. You are given that
m (198Au) = 197.968233 u
m (198Hg) =197.966760 u
Write the basic nuclear process underlying β+ and β– decays.
Write the β-decay of tritium in symbolic form.
Write the basic nuclear process of neutron undergoing β-decay.
Why is the detection of neutrinos found very difficult?
What is the difference between cathode rays and beta rays? When the two are travelling in space, can you make out which is the cathode ray and which is the beta ray?
In beta decay, an electron (or a positron) is emitted by a nucleus. Does the remaining atom get oppositely charged?
Consider a sample of a pure beta-active material.
Complete the following decay schemes.
(a) `"" _88^226Ra → alpha+`
(b) `""_8^19O → _9^19F+`
(c) `""_13^25Al → ""_12^25Mg+`
A free neutron decays into ______.
