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प्रश्न
Identify the nature of the radioactive radiations emitted in each step of the decay process given below.
`""_Z^A X -> _Z^A _-1^-4 Y ->_Z^A _-1^-4 W`
उत्तर
`""_Z^A X -> _Z^A _-1^-4 Y ->_Z^A _-1^-4 W`
An alpha particle `""_2^4 "He"` is emitted in the first reaction as the atomic mass of Y is reduced by 4 and the atomic number is reduced by 2. An election `""_-1^0"e"` is emitted in the second reaction as the atomic mass of W remains the same and the atomic number is increased by 1.
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संबंधित प्रश्न
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\[\ce{^223_88Ra -> ^209_82Pb + ^14_6C}\]
\[\ce{^223_88 Ra -> ^219_86 Rn + ^4_2He}\]
Calculate the Q-values for these decays and determine that both are energetically allowed.
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`""^228"Th" → ""^224"Ra"^(∗) + alpha`
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Atomic mass of 228Th is 228.028726 u, that of 224Ra is 224.020196 u and that of `""_2^4H` is 4.00260 u.
(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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