InterviewSolution
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InterviewSolution
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Calculate the Q-value in the following decays: (a) `^19 O rarr ^19 F + e + vec v`. (b) `^25 A1 rarr ^25 Mg + e^+ + v`. The atomic masses needed are as follows : `^19 O 19.003576 u` `^19 F 18.998403 u` `^25 A1 24.990432 u` `^25 Mg 24.985839 u` |
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Answer» (a) The `Q`-value of `beta^(-)` decay is `= [m(.^(19)O)-m(.^(19)F)]c^(2)` `=[19.003576u-18.998403 u](931 MeV//u)` `=4.816 MeV` (b) The `Q`-value of `beta^(+)`-decay is `Q=[m(.^(25)Al)-m(.^(25)Mg)-2m_(e )]c^(2)` `=[24.99032u-24.985839u-2xx0.511(MeV)/(c^(2)]c^(2)` `=(0.004593u)(931MeV//u)-1.022 MeV` `=4.276 MeV-1.022 MeV=3.254 MeV.` |
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