1. What is the mass of a photon? 2. Does a photon have momentum? 3. Using your Compton notesheet, find an equation that uses momentum.

Slides:

Advertisements

Similar presentations

The 4 important interactions of photons

Advertisements

Some issues in Science? Pluto Duck-Billed Platypus.

Matter is a Wave Does not apply to very large objects I.e. - things bigger than an atom A baseball has a wavelength of about m when moving 30 m/s.

Quantum Mechanics Chapter 7 §4-5. The de Broglie Relation All matter has a wave-like nature… All matter has a wave-like nature… Wave-particle.

Wave/Particle Duality. Question: What happens if we repeat Young’s double slit experiment with a beam of electrons (particles) instead of light? Answer:

Matter Waves. Photon Duality  The photon can behave like a wave or a particle. Planck’s quantaPlanck’s quanta  It behaves like a wave in diffraction.

AP Physics Chapter 28 Quantum Mechanics and Atomic Physics

The de Broglie Wavelength Lesson 11. Review Remember that it has been proven that waves can occasionally act as particles. (ie: photons are particles.

Topic 13: Quantum and Nuclear physics “The wave nature of matter” Matter behaving as a wave? Ridiculous!

Electromagnetic Radiation and Atomic Structure EMR and Properties of Light Bohr Model of the Atom & Atomic Line Spectra Quantum Theory Quantum Numbers,

Why are electrons restricted to specific energy levels or quantized? Louis de Broglie – proposed that if waves have particle properties, possible particles.

Section 2: Velocity and Momentum

Dr. Jie ZouPHY Chapter 40 Introduction to Quantum Physics (Cont.)

AS Physics Unit 3 Matter Waves Extension AS Physics Unit 3 Matter Waves Extension Mr D Powell.

Classical ConceptsEquations Newton’s Law Kinetic Energy Momentum Momentum and Energy Speed of light Velocity of a wave Angular Frequency Einstein’s Mass-Energy.

Newton’s Laws White Board Review Pick up a board, a marker, a paper towel & a calculator!

Wave Nature of Matter Light/photons have both wave & particle behaviors. Waves – diffraction & interference, Polarization. Acts like Particles – photoelectric.

Light particles and matter waves?

 Photo-Electric Effect  Light causes a metal to eject electrons  Amount of electron ejected depends on frequency of wave not intensity  Einstein’s.

These notes were typed in association with Physics for use with the IB Diploma Programme by Michael Dickinson For further reading and explanation see:

Metal e-e- e-e- e-e- e-e- e-e- e+e+. Consider a nearly enclosed container at uniform temperature: Light gets produced in hot interior Bounces around randomly.

Chapter 29 Particles and Waves.

Physics Lecture 7 2/16/ Andrew Brandt Monday February 16, 2009 Dr. Andrew Brandt 1.Wave Properties of Particles 2.de Broglie Waves 3.Matter.

1 High School Technology Initiative © 2001 Quantum History Pasteurization 1861 Albert Einstein 1905 Louis de Broglie 1924 Max Planck 1900 Columbus discovers.

Chapter 5/1© 2012 Pearson Education, Inc. Wavelike Properties of Matter The de Broglie equation allows the calculation of a “wavelength” of an electron.

Chapter 6 Electronic Structure of Atoms. The Wave Nature of Light The light that we can see with our eyes, visible light, is an example of electromagnetic.

De Broglie wavelengths

Lecture_06: Outline Special Theory of Relativity  Principles of relativity: length contraction, Lorentz transformations, relativistic velocity  Relativistic.

The Compton Effect. The Compton Effect (in physics)‏ The scattering of photons by high-energy photons High-energy X-ray photons hitting a metal foil eject.

Physics 1202: Lecture 31 Today’s Agenda Announcements: Extra creditsExtra credits –Final-like problems –Team in class HW 9 this FridayHW 9 this Friday.

Particles as waves and Light as particles Chapter 6 part II.

Compton Effect and Matter Waves

Electromagnetic radiation behaves as particles 1. Notes of the problem discussed Tuesday. 2. Quiz 9.11 and a few comments on quiz Topics in EM.

Wave Particle Duality Quantum Physics Lesson 3 Today’s Objectives Explain what is meant by wave-particle duality. Explain what is meant by wave-particle.

Louis de Broglie Light is acting as both particle and wave Matter perhaps does also p = momentum (p = mv) h = Planck’s constant (6.626 x Js) = de.

Modern Physics Chapters Wave-Particle Duality of Light Young’s Double Slit Experiment (diffraction) proves that light has wave properties So does.

So what about mass? 1. What happens to time from the frame of reference of a stationary observer on Earth as objects approach c? 2. What notation is given.

Momentum pg. 27. Objectives Calculate the momentum of an object. Identify the units of momentum. Calculate the momentum of a physical system consisting.

Louis de Broglie, (France, ) Wave Properties of Matter (1923) -Since light waves have a particle behavior (as shown by Einstein in the Photoelectric.

Chemistry I Chapter 4 Arrangement of Electrons. Electromagnetic Radiation Energy that exhibits wavelike behavior and travels through space Moves at the.

THE COMPTON EFFECT Energy and momentum are conserved when a photon collides with an electron.

Particle wave duality 1 Particle - Wave Duality. particle wave duality 2 Einstein’s Famous Idea in Equation Form Einstein knew that energy is involved:

Wave-Particle Duality

Warm-Up What is the difference between the Bohr’s Model of the Atom and the Quantum Model of the atom. What wavelength is associated with an electron.

DeBroglie Wave Nature of Matter.

Quantum Physics Lesson 6

Finish up the photoelectric effect

Electromagnetic Radiation

Light and Quantized Energy

Matter Waves Louis de Broglie

Wave Particle Duality Light behaves as both a wave and a particle at the same time! PARTICLE properties individual interaction dynamics: F=ma mass – quantization.

Chapter 31 Light Quanta.

Waves Electrons (and other particles) exhibit both particle and wave properties Particles are described by classical or relativistic mechanics Waves will.

Tools of the Laboratory

Electron Clouds and Probability

The de Broglie Wavelength

Photoelectric Effect (1)

Electron Clouds and Probability

Matter Waves Louis de Broglie

Compton Effect and de Broglie Waves

Wave/Particle Duality

General Physics (PHY 2140) Lecture 28 Modern Physics Quantum Physics

The Quantum Mechanical Model

2.2 Notes What is the difference between speed and velocity?

Compton Effect de Broglie Wavelengths

Development of Quantum Mechanics Planck and Einstein

Wave Nature of Matter Just as light sometimes behaves as a particle, matter sometimes behaves like a wave. The wavelength of a particle of matter is: This.

The Wave-Particle Duality

Presentation transcript:

1. What is the mass of a photon? 2. Does a photon have momentum? 3. Using your Compton notesheet, find an equation that uses momentum.

Mr. Davis Baltimore Poly

What equation did you learn last year for momentum? P=mv Momentum = Mass*Velocity

What is Einstein’s Famous Equation? E= mc 2

For a particle with zero momentum p = 0: A light photon has m = 0, but it does have momentum p: E = mc 2 E = pc

 What is one way Light, or Photons, act as a wave?  Interference  Reflection  Dispersion

 What is one way Light, or Photons, act as a particle?  Compton Effect  Photoelectric Effect

Louis de Broglie hypothesized that because photons have wave properties, all matter could have wave properties. He was the first person to win a Nobel Prize in Physics for something that he did in his doctoral dissertation.

What is a property that all waves have? Wavelength!!! If Matter acts like a wave, it should have a _________?

Lets find the wavelength of a photon. Using the equations from the Do Now, Solve for the wavelength in terms of momentum De Broglie Wavelength of a photon:

All objects have wavelengths which can be found from their momentum Substitute in what we know about momentum of objects with mass to the previous de Broglie equation! de Broglie Wavelength:

Calculate the de Broglie wavelength for an electron moving at 10 7 m/s. Mass of an electron: 9.1x kg 7.28x m

That’s all there is to de Broglie. Tuesday we will have a 20 minute “mini-quiz” It’s short!! It will be on a half sheet of paper

 You have the rest of class to work on your classwork.  You will have an exit ticket at the end of class.  Use SI units (kg, m, ect)

 If Mr. Davis runs at 4.38 m/s and is 60kg. What is his de Broglie wavelength?  Bonus: ◦ How many minutes does it take him to finish a half marathon, 21km. ◦ How fast per mile does Mr. Davis run if a mile is 1600m. (For example 8:10 minutes per mile)

 Calculate the de Broglie wavelength for a 50 g ball thrown with a speed of 25 m/s.

 The de Broglie wavelength of an object depends on what two variables?  Mass  Velocity

 Which of the following has the longest de Broglie wavelength if they were moving at the same speed? ◦ A marble ◦ A Baseball ◦ A Car ◦ The Earth

 Calculate the de Broglie wavelength of a.5kg basketball sitting stationary on the ground. It’s undefined, because the object is stationary.

 You have the rest of class to work on your classwork “de Broglie Wavelength”.  There is a bonus classwork if you finish early.  You will have an exit ticket at the end of class.

 Design and solve your own de Broglie wavelength problem!  Your problem should be at least two sentences and make your problem involve stuff you can touch and see.  Bonus points for creative problems!!!