3.2.1.6 Particles and Radiation: Quarks and antiquarks

Question 1

What is the quark structure of a proton?

Answer 1

uud

Question 2

What is the quark structure of a neutron?

Answer 2

udd

Question 3

What is the most stable baryon?

Answer 3

Proton

Question 4

What is the quark composition of baryons?

Answer 4

Three quarks

Question 5

What is the quark composition of mesons?

Answer 5

An quark and antiquark

Question 6

What are the quark combinations of K-, K0 and K+?

Answer 6

K- = u anti s
K0 = d anti s or s anti d
K+ = s anti u

Question 7

What is the quark composition of pi+, pi0 and pi-?

Answer 7

pi+ = u anti d
pi 0 = u anti u, d anti d or s anti s
pi- = d anti u

Question 8

What is quark confinement?

Answer 8

Where it’s not possible to get a quark by itself

Question 9

What is changing a quark’s character?

Answer 9

When you change a quark into another quark

Question 10

What can change a quark’s character?

Answer 10

Weak interaction

Question 11

Describe changing quark character in beta minus decay

Answer 11

A neutron changes into a proton, goes from udd to uud.

Question 12

Describe changing quark character in beta plus decay

Answer 12

A proton changes into a neutron, so from uud to udd