Exam 44: Quarks, Leptons, and the Big Bang

A particle with spin angular momentum is called a:

A certain process produces baryons that decay with a lifetime of 4 * 10^-24 s.The decay is a result of:

If dark matter did not exist it is likely that:

In terms of quark content a beta decay can be written:

The interaction $\pi$ ^- + p $\rightarrow$ $\pi$ ^- + $\Sigma$ ⁺ violates the principle of conservation of:

An example of a fermion is a:

The up quark u has charge +2/3 and strangeness 0; the down quark d has charge -1/3 and strangeness 0; the strange quark s has charge -1/3 and strangeness -1.This means there can be no meson with:

The baryon number of a quark is:

All particles with spin angular momentum :

Different types of neutrinos can be distinguished from each other by:

The microwave background radiation is a result of the big bang.The big bang also resulted in a uniform distribution of background:

The two basic interactions that have finite ranges are:

Color is carried by:

An electron participates in:

How many different flavors of quarks are there (not counting antiquarks)?

Messenger particles of the strong interaction are called:

Which of the following statements is correct?

A baryon with strangeness -1 decays via the strong interaction into two particles, one of which is a baryon with strangeness 0.The other is:

The velocities of distant objects in the universe indicate that the time elapsed since the big bang is about:

The interaction $\pi$ ^- + p $\rightarrow$ K^- + $\Sigma$ ⁺ violates the principle of conservation of: