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Take out hwk & tables. Compare answers to hwk sets. List 2 pieces of evidence that light is a wave. Diffraction Interference. List 1 piece of evidence that light is a stream of particles. Photoelectric effect. List 1 piece of evidence for the Bohr model of the atom.

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Take out hwk tables

Take out hwk & tables.

Compare answers to hwk sets.


Take out hwk tables

List 2 pieces of evidence that light is a wave.

  • Diffraction

  • Interference.

List 1 piece of evidence that light is a stream of particles.

  • Photoelectric effect

List 1 piece of evidence for the Bohr model of the atom.

  • Emission or Absorption spectra


Ref table page 3

Ref Table Page 3.


Take out hwk tables

Standard Model

  • Physicists have developed a theory called “The Standard Model” that explains what the world is and what holds it together.


Standard model

Standard Model

  • It was once thought that the fundamental particles were electrons, protons, neutrons.

  • Now more & smaller subatomic particles found – quarks & leptons that comprise matter.

  • Forces are carried by particles too!


All matter classified hadrons or leptons hadrons made from quarks

All matter classified Hadrons or LeptonsHadronsmade from quarks.

p+ & no

Quarks can’t exist alone.


Protons neutrons are baryons made of only up down quarks

Protons, Neutrons: are baryons made of only up & down quarks.

  • Ex 1. How many up & down quarks in a p+?

  • Charge = +1

  • Baryons have 3 quarks only.

  • 2 up & 1 down.

  • u + u + d

  • +2/3 +2/3 – 1/3 = +1


Take out hwk tables

  • Ex 2: How many up & down quarks in a no?

  • Charge = 0

  • 1 up & 2 down.

  • u d d

  • +2/3 -1/3 -1/3 = 0


The atom

The Atom


Leptons

Leptons

  • The most familiar member of this group is the electron e, but there are also heavier particles called the muon m and the tau t.

  • For each of those, there is a smaller “partner” called a neutrino n .

  • The leptons are all capable of independent existence.


All particles have anti particles same mass

All particles have anti-particles same mass.

  • Antiparticles behave same as corresponding matter particles, except they have opposite charges.

  • A proton is electrically positive - an antiproton is negative.

  • Gravity affects matter and antimatter the same way.

  • If matter & corresponding antimatter meet, they annihilate into pure energy!


Antimatter notation add bar to antimatter mesons quark antiquark

Antimatter Notation add bar to antimatter: Mesons quark & antiquark.


3 a particle is composed of 2 charm 1 bottom quark

3. A particle is composed of 2 charm, & 1 bottom quark.

  • What type of particle is it?

  • Write the symbols & charges for all the particles.

  • c c b

  • +2/3+2/3-1/3

What is its charge?

  • +1.


4 a particle is composed of 1 anti strange 1 down quark

4. A particle is composed of 1 anti-strange, & 1 down quark.

  • Write the symbols & charges for all the particles.

  • What type of particle is it?

  • s d

  • +1/3-1/3

What is it’s charge?

  • 0.

  • Meson.


All independent particles must have whole number of elementary charge

All independent particles must have whole number of elementary charge!


Forces force exchange particles 4 fundamental forces

Forces & Force Exchange Particles4 Fundamental Forces

The universe exists because the fundamental particles interact. These interactions include 4 attractive & repulsive forces, decay, & annihilation.

Force particles are gaugebosons.

  • Strong Nuclear (Nuclear)

  • Electromagnetic

  • Weak (Nuclear)

  • Gravity


Strong force

Strong Force

  • Short Range, Attractive only – holds nuclear particles together.

  • Particle = gluons.


Electromagnetic force

Electromagnetic Force

  • Long range. Attracts & repels charged particles (Coulomb’s Law).

  • Carrier particle = photon.


Weak force

Weak Force

  • In the nucleus. Involved with decay of particles. Short range.

The carrier particles of the weak interactions are the W and Z bosons.


Gravity

Gravity

  • Long range weakest force. Attractive only.

  • The gravity force carrier particle has not been found. It, however, is predicted to exist and may someday be found: the graviton.


Quarks leptons 5 40 min http www youtube com watch v atfckbzw8qy

Quarks & Leptons 5:40 min.http://www.youtube.com/watch?v=aTFCKbZw8QY

Hwk:

Read Text 25-4 pg 917-923

Do pg 923 #1,2 Pg 928 #30 – 37 Full sentences!

2. Bring back textbook!


Take out hwk tables

Summary:

  • EM energy can be thought of as tiny particles (photons) related to f.

  • E in EM radiation/photons E = hf.

  • Matter can be thought of as E stored in nucleus.

  • E in matter E = mc2. Joules.

  • 1 u = 931 MeV. 1 x 106eV = 1 MeV.

  • E measured in eV and J.

  • 1.6 x 10-19 J = 1 eV .


Take out hwk tables

The charge on the quark below would be:

  • +1

  • -1

  • +2/3

  • -2/3


Take out hwk tables

This particle is a:

  • Lepton

  • Proton

  • Meson

  • neutron


Cern standard model http www youtube com watch v v0kjxsgrvoa feature related 5 minutes

Cern Standard Modelhttp://www.youtube.com/watch?v=V0KjXsGRvoA&feature=related5 minutes


Comprehensive standard model summery 15 minutes cassiopeia http www youtube com watch v k6i qe8aige

Comprehensive Standard Model Summery(15 minutes)Cassiopeiahttp://www.youtube.com/watch?v=K6i-qE8AigE


Quantum song

Quantum Song

  • http://www.youtube.com/watch?feature=player_detailpage&v=DZGINaRUEkU


Take out hwk tables

  • What is Higgs Boson 3:30

  • http://www.youtube.com/watch?v=RIg1Vh7uPyw

  • What now for the Higgs 8:00 min w/ad.

  • http://www.youtube.com/watch?v=649iUqrOKuE


Regents problems wksht

Regents Problems Wksht.


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