Lessons 26-31 Relativity and Quantum theory

Lesson #26

Chapter 26 Light

The Scottish physicist James Clerk Maxwell, b. Nov. 13, 1831, d. Nov. 5, 1879, did revolutionary work in electromagnetism

Maxwell's Equations video (1st 15 minutes)

Taking the basic laws of electricity and magnetism he show that all electromagnetic waves (including visible light) travel at a speed of 300,000,000 m/s through space.

First 15 minutes of Maxwell's equations #39

All of  Optics video #40

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Summary of Terms and Summary of Formulas:

Review Questions  (look over all)

RadioTransmitter     

  

 

 

   
Lesson #27

Chapter 29 light waves  (focus on interference from single and double slits and thin films) 

We will not be discussing polarization

  Came up with a formula to explain spectral lines of hydrogen atom.

Emission Spectra

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Summary of Terms and Summary of Formulas:

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  Double slit experiment ~1802 confirming interference of light waves.

Diffraction from single slit       BothSingleAndDouble

diffraction from double slit

thin films  Thin Film2  Air between glass

Lesson #29

Chapter 31 Light quanta

Chapter 32 The atom and the quantum

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Summary of Terms and Summary of Formulas:

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JJ Thompson discovers electron (1899)

      1900

Planck's Constant  h=6.63x10-34 J-s  (a.k.a. very tiny)  Made the first use of the theoretical idea that energy came in packets (quantum, quanta)

Energy= h * frequency

E = h f

1905

Photoelectric effect

Photoelectric Effect
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or from phet 

  Rutherford Atom  (~1910) notes   or from phet

(Rutherford atom was unstable as it would continuosly give off light)

    Neils Bohr (~1913)

Models of the hydrogen Atom or from phet 

Bohr Model  #2

see video #49 at MechanicalUniverse

see video #50 at MechanicalUniverse

  DeBroglie Waves 

 elctron wave in Bohr atom  (click on wave model and select quantum n=5)

 (BU physics 2nd semester Modern Physics de Broglie)

  Wave/particle interferance

  Heisenberg's Uncertainty Principle   Equations " It is impossible to precisely and simultaneously know where an object is and where it is going "  (R.M. MacKay)

Joke

  Schroedinger's Wave equation  Resource  Simulation

 

Quantum Tunneling and Wave Packets
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  (BU physics 2nd semester Modern Physics Probability density cloud)

 

Lesson #31

Chapter 35 Special Relativity

Relativity Calculator 

Mechanical Universe Series

 

Wednesday class.  watch videos #41 and #44 from Mechanical Universe Series

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Summary of Terms and Summary of Formulas:

Review Questions  (look over all)

Michaelson Morley Experiment  see video #41 at MechanicalUniverse

 interferometer   Interferometer2

 

timeDilation     tD2  (moving clocks run slowly)

lengthContraction  (moving lengths are shorter in direction of motion and unaltered in directions perpendicular to the motions)

Simultaneity  (the concept of when events are simultaneous depends on ones reference frame)

see video #42 at MechanicalUniverse

 

see video #43 at MechanicalUniverse

Relative speeds add differently and can never be faster than the speed of light.  Light travels a 300,000,000 m/s (3x108 m/s) as viewed by all reference frames.

Twin Paradox movie   TwinParadoxFlashLesson

 

E=mc2

1 g of matter =0.001 kg conbining with 1 g of antimater would create 0.002 kg worth of energy.

E=(0.002 kg)(3x108 m/s)2 = 18x1013 Joules

see video #44 at MechanicalUniverse

 

SpecialRelativityCalculator

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