Standard Model of Particle Physics

Pass up your homework

Videohttps://www.youtube.com/watch?v=V0KjXsGRvoA

Goal of Physics

• To answer the question: How does the universe work?

• By studying the world as an observer, we can begin to describe the universe just as someone watching a chess match could describe the game of chess

Rules of the Universe

FundamentalForcesForce Range Strength Carrier Whatitdoes

StrongNuclear 10-15 m 1 gluons Holdsnucleitogether

Electromagnetism Infinite 1/137 photons Holdsatomsandmoleculestogether

WeakNuclear 10-18 m 10-6 W&Zbosons betadecay

Gravity Infinite 10-39 graviton? Holdsobjectswithmasstogether

Standard Model of Particle Physics

Anti-matter explainedhttps://www.youtube.com/watch?v=Lo8NmoDL9T8

Matter/Anti-matter• Made up of PARTICLES and their

ANTI-PARTICLES with EQUAL mass and OPPOSITE charge.

• Anti-particles are denoted by a bar over the symbol

Reference Table (Page 3)

7 examplesHave your reference tables out

Example #1

What is the charge on an anti-tau particle?

Example #1 Solution

• tau = -1e

• anti-tau = +1e

Reference Table (Page 3)

Example #2

A charged kaon (K+) is composed of an up quark and an anti-strange quark.

What is the charge on this type of kaon?

Example #2 Solution

• up = + 2/3e

• anti-strange = +1/3e

• kaon = +1e

Reference Table (Page 3)

Question 3

Choice 3 (charge of +1e and is made of quarks)

Question 4

Choice 1

Question 5

Choice 4

Question 6

Choice 4

Question 7

Choice 2

Homework

• Page 197

• Questions 50-59