Match the process with the fundamental interaction responsible for this process. a. A neutron outside a nucleus decays into a proton, electron, and antineutrino.
b. The Earth pulls on the Moon.
c. The gravitational interaction.
d. Protons in a nucleus repel each other.

1. The electromagnetic interaction
2. the gravitational interaction
3. The weak interaction
4. The strong interaction

a - 3 ,    b - 2 ,   c-- 2 ,      d - 1    

Explanation:

In this exercise we must relate the different physical processes with the force responsible for the process:

a. Neutron decay

    the disintegration of the neutral is an example of the weak interaction

         a - 3

b. The Earth pulls the Moon.

    In this case as the two bodies and with great mass, the interaction is the gravitational interaction

          b - 2

c. gravitational interaction

             c-- 2

d. Protons repel other protons in the nucleus.

    Since the two particles have a positive charge, the interaction is electromagnetic

            d - 1

missing the case of the strong interaction that is responsible for the attraction of proton proton and proton neutron within the nucleus

That's a pretty cool fact