Week 4 Lesson 2 Hadrons

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Physics

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12th Grade

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Peggy Kao

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9 Slides • 8 Questions

Week 4 Lesson 2 Hadrons

Lesson goal: To understand the composition of mesons and baryons in terms of quarks

Let's start with a quick revision

Multiple Choice

A point source Q is placed on a square grid as shown below.

Which of the following points experience equal magnitudes of electric field strength?

B and E

A, B and C

A and C

A, E and C

Multiple Choice

A certain string just breaks when it is under 400 N of tension. A boy uses this string to whirl a 10 kg stone in a horizontal circle of radius 10 m. The boy continuously increases the speed of the stone.

Determine the speed at which the string will break.

20 m s^-1

80 m s^-1

400 m s-1

10 m s^-1

Multiple Choice

Determine the energy of the 3rd orbit in an H-atom, given that the ground state is -13.6 eV.

-1.51 eV

+ 1.51 eV

- 13.6 eV

- 3.40 eV

Multiple Choice

Which quark has a charge of +2/3 e?

Elementary particles

In general, there are three general types of elementary particles in the standard model:
Hadrons: particles made of quarks
Leptons: particles not made of quarks
Force carriers: gluon and gauge bosons

Hadrons

Hadrons are particles composed of quarks. Please be aware that not all particles are hadrons, for example gluons and gauge bosons are not hadrons (we'll learn about them next week).
There are two types of Hadrons:
Mesons: consist of two quarks.
Baryons: consist of three quarks.

Let's finish with a quick quiz

Multiple Choice

Which combination of quarks can form a meson?

u d

d d

u u

u $\overline{d}$

Multiple Choice

Which of the following is a baryon?

electron

proton

pion

electron nutrino

Multiple Choice

What is the charge of a baryon made of sss?

+1 e

-1 e

0 e

-1/3 e

Multiple Choice

Which of the following lepton is a 0 charge particle?

electron

muon

anti-tau

tau nutrino

Homework: complete check your learning 13.1 (due by Thursday's lesson)

Week 4 Lesson 2 Hadrons

Lesson goal: To understand the composition of mesons and baryons in terms of quarks

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