Physics 2.4 Quarks and Antiquarks

Question 1

What are the 3 types of quark (that are needed in the course)?

Answer 1

Up, down and strange

Question 2

What is the charge, baryon number and strangeness of an up quark?

Answer 2

Charge: +(2/3)e
Baryon number: +1/3
Strangeness: 0

Question 3

What is the charge, baryon number and strangeness of a down quark?

Answer 3

Charge: -(1/3)e
Baryon number: +1/3
Strangeness: 0

Question 4

What is the charge, baryon number and strangeness of a strange quark?

Answer 4

Charge: -(1/3)e
Baryon Number: +1/3
Strangeness: -1

Question 5

What is the quark composition of a baryon?

Answer 5

Baryons consist of three quarks

Question 6

What is the quark composition of an anti-baryon?

Answer 6

Anti-baryons consist of three antiquarks.

Question 7

What is the quark composition of a meson?

Answer 7

Mesons consist of a quark and an antiquark

Question 8

What is the change in quark character in beta-minus decay?

Answer 8

In beta-minus decay, a down quark changes character to an up quark

Question 9

What is the change in quark character in beta-plus decay?

Answer 9

In beta-plus decay, an up quark changes character to a down quark