Chap 15. Particle physics

• A

• B

• C

• D

Which particle is a fundamental particle?

• electron

• hadron

• neutron

• proton

• A

• B

• C

• D

In Beta minus decay, a neutron inside a nucleus changes to a proton.

Which statement describes the quark composition of the nucleus during the decay?

• The number of down quarks decreases by one

• The number of down quarks increases by one

• The number of down quarks stays the same

• The number of up quarks stays the same

• A

• B

• C

• D

A hadron is composed of three quarks. The hadron has a charge.

What is a possible quark composition of the hadron?

• down, down, up

• down, up, strange

• up, strange, strange

• up, up, strange

• A

• B

• C

• D

Which combination of up (u) and down (d) quarks forms a proton?

• uuu

• uud

• udd

• ddd

An unstable nucleus decays by emitting a Beta plus particle.

Which statement is correct?

• An antineutrino is also emitted.

• A neutron changes into a proton.

• Mass-energy is conserved.

• The nucleon number is not conserved.

Which statement is not correct?

• An antineutrino is a fundamental particle.

• An electron is made up of a quark and an antiquark.

• A neutrino is a lepton.

• A neutron is composed of three quarks.