In the case of the electromagnetic interaction the particle exchanged is a photon.

Determine whether the following reaction conserve or violate baryon number.

$p^{+}+p^{-}\to {\mathrm{\pi }}^{+}+{\mathrm{\pi }}^{-}$

The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Use the above diagram to construct a new Feynman diagram representing the scattering of electron anti-neutrino off a muon.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

$K^0\to {\mathrm{\pi }}^{-}+{\mathrm{\pi }}^{+}$

Determine whether the following reaction conserve or violate baryon number.

${\Lambda }^{\circ }\to {\mathrm{\pi }}^{+}+{\mathrm{\pi }}^{-}$

The muon decays according to ${\mu }^{-}\to e^{-}+\overline{{\nu }_e}+{\nu }_{\mu }$. A Feynman diagram for this decay is shown below.

Identify the three unlabelled particles in the diagram.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

${\mathrm{\pi }}^{-}+{\mathrm{p}}^{+}\to {\mathrm{\pi }}^{-}+{\mathrm{\Sigma }}^{+}$

Represent the union of two sets by Venn diagram for each of the following.

$X=\{x | x$ is a prime number between $80$ and $100\}$

$Y=\{y | y$ is an odd number between $90$ and $100\}$

Explain, in terms of quarks, the difference between a baryon and a meson.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

${\mathrm{\pi }}^{-}+{\mathrm{p}}^{+}\to {\mathrm{K}}^0+{\mathrm{\Lambda }}^0$

The interaction responsible for the decay of the muon has a very short range. State the property of the exchange particle that is responsible for the short range.

What process does this Feynman diagram represent?

Write down the reaction equation representing the decay ${\mu }^{+}$, which is anti-particle of the ${\mu }^{-}$.

Copy and complete the Feynman diagram to represent the beta minus decay of neutron, making sure that you label all particles involved.

Determine whether the following reaction conserve or violates strangeness. (use ${\mathrm{\pi }}^{\circ } \mathrm{d}\overline{\mathrm{d}}, {\mathrm{K}}^{+}=\mathrm{u}\overline{\mathrm{s}}, {\mathrm{\Lambda }}^{\circ }=\mathrm{uds},{\mathrm{K}}^{\circ }=\mathrm{d}\overline{\mathrm{s}}, {\mathrm{\Sigma }}^{-}=\mathrm{dds}$)

$p^0+n\to K^{+}+{\Sigma }^{-}$