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Question

Which of the following reactions is(are) possible for isolated decaying particles on the right side, without requiring energy?
  1. pn+e++v
  2. np+e+¯v
  3. 19O19F+e+¯v
  4. 25Al25Mg+e+¯v


Solution

The correct options are
B np+e+¯v
C 19O19F+e+¯v
Second and third process are possible.

A) Rest mass energy of neutron is greater than proton. So conversion of p to n is not possible for an isolated proton and requires energy.
D) Charge is not conserved. 25Al converts to 25Mg when proton converts to neutron hence correct process will be25Al25Mg+e++v

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