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प्रश्न
Write the β-decay of tritium in symbolic form.
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उत्तर
The β-decay of tritium is shown below
\[\ ^{3}_{1}{H} \to ^{ 3}_{2}{ He} + e^- + \bar{{v_e}}\]
It converts into a helium-3 nucleus by releasing an electron (or β particle) and an antineutrino.
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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
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.
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?
During a negative beta decay,
Consider a sample of a pure beta-active material.
A free neutron beta-decays to a proton with a half-life of 14 minutes. (a) What is the decay constant? (b) Find the energy liberated in the process.
(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.)
Complete the following decay schemes.
(a) `"" _88^226Ra → alpha+`
(b) `""_8^19O → _9^19F+`
(c) `""_13^25Al → ""_12^25Mg+`
