# Worksheet: Strangeness

In this worksheet, we will practice determining the strangeness of composite particles and sets of particles and whether given interactions conserve strangeness.

**Q1: **

What is the strangeness of a strange quark?

**Q2: **

A is a baryon with the composition uss. What is the strangeness of the ?

**Q3: **

What is the strangeness of an electron?

**Q4: **

A phi meson is a particle that is made up of a strange quark and a strange antiquark. What is the strangeness of a phi meson?

**Q5: **

What is the strangeness of a tau neutrino?

**Q6: **

What is the strangeness of a charm quark?

**Q7: **

A is a baryon with the composition uds. What is the strangeness of the ?

**Q8: **

What is the strangeness of a strange antiquark?

**Q9: **

The following equation shows a Xi baryon decaying into a lambda baryon and a pion, which is an interaction that does not conserve strangeness,

What is the total strangeness before the interaction takes place?

What is the total strangeness after the interaction takes place?

**Q10: **

The following equation shows a meson decaying into a kaon and an antikaon,

What is the total strangeness before the interaction takes place?

What is the total strangeness after the interaction takes place?

**Q11: **

An is a baryon that is made up of only strange quarks.

What is the strangeness of the ?

What is the relative electric charge of the ?