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13.Nuclei
medium
The decay of a proton to neutron is :
A
not possible as proton mass is less than the neutron mass
B
possible only inside the nucleus
C
not possible but neutron to proton conversion is possible
D
always possible as it is associated only with $\beta^{+}$ decay
(JEE MAIN-2021)
Solution
It is possible only inside the nucleus and not otherwise.
Standard 12
Physics