Which fundamental interaction (gravitational, electromagnetic, strong, or weak) is responsible for each of these processes? (a) A neutron outside a nucleus decays into a proton, electron, and...

Which fundamental interaction (gravitational, electromagnetic, strong, or weak) is responsible for each of these processes?

(a) A neutron outside a nucleus decays into a proton, electron, and antineutrino.

(b) Protons and neutrons attract each other in a nucleus.

(c) The Earth pulls on the Moon.

(d) Protons in a nucleus repel each other.

Section 3.2