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JEE Main 202118 MarchEvening Shift
Exam
JEE Main
Year
2021
Date
18 March
Shift
Evening Shift
Subject
Physics
Chapter
Nuclear Physics

JEE Main 2021 · 18 March · Evening Shift · Physics · Nuclear Physics

The decay of a proton to neutron is :

The decay of a proton to neutron is :

Options

  1. Anot possible as proton mass is less than the neutron mass
  2. Bpossible only inside the nucleus
  3. Cnot possible but neutron to proton conversion is possible
  4. Dalways possible as it is associated only with β+{\beta}^{+} decay

Correct answer

B. possible only inside the nucleus

Step-by-step solution

It is possible only inside the nucleus and not otherwise as it can not decay to a state of greater mass. Inside a nucleus however, the situation is different, as the binding energy of a nucleus provides the necessary energy to compensate for the neutron-proton mass difference.

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