State the four fundamental interactions of nature.
A positive muon (μ+\mu^+μ+) is an unstable particle. State the products of the decay of a free positive muon.
Explain which of the fundamental interactions is responsible for the decay of the positive muon.
The electromagnetic interaction between an approaching electron and a proton causes them to attract and change their directions of motion. Explain, using the concept of exchange particles, how this interaction results in a change in their paths.
