Wave-Particle Duality

Slides:

Advertisements

Similar presentations

© John Parkinson 1 MAX PLANCK PHOTOELECTRIC EFFECT.

Advertisements

The Photoelectric Effect

The Photoelectric Effect Key Points. What is it ? Electrons are emitted from zinc when ultraviolet radiation shines on it. Other metals emit electrons.

Physics 6C The Photoelectric Effect Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB.

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

Knight - Chapter 28 (Grasshopper Book) Quantum Physics.

_______________physics 1.Matter is a____________________ 2.Light is a _________________. particle wave Classical This is "everyday" physics that deals.

3.2 More about photo electricity The easiest electrons to eject are on the metals surface And will have maximum kinetic energy Other electrons need more.

Physics 6C Photons Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB.

WAVE PARTICLE DUALITY Principles of Physics. Is light a wave or a particle??  Isaac Newton said light is a particle  Christian Huygens (explained diffraction)

6. Atomic and Nuclear Physics Chapter 6.4 Interactions of matter with energy.

MAX PLANCK PHOTOELECTRIC EFFECT © John Parkinson.

What is the nature of Part II. Last week we surmised that photons must carry momentum in spite of the fact that they are massless. Last time we learned.

The photoelectric effect

Experimental evidence that light is a wave:. Shine light of particular wavelength/frequency/color on metal plate C Electron ejected from plate C (“photo-electron”)

Lecture 15: Electromagnetic Radiation

Lecture 16: Electromanetic Radiation Reading: Zumdahl 12.1, 12.2 Outline –The nature of electromagnetic radiation. –Light as energy. –The workfunction.

The Photoelectric E ffect By Eleanor Girdziusz. The Photoelectric Effect “The phenomenon that when light shines on a metal surface, electrons are emitted”

What is the nature of Part II. Last week we surmised that photons must carry momentum in spite of the fact that they are massless. Last time we learned.

AP Physics 12 – Class Starter FR Question Please grab a whiteboard, markers and a couple friends to answer the following question!

QW *Use the light kits at your tables to perform and answer the following: Shine red, blue, and green lights at glow in the dark material 1. Which one.

Aim: How can we apply mathematics to the photoelectric effect? In the photoelectric effect, how do you increase: The number of ejected electrons? The KE.

11.1 – THE PHOTOELECTRIC EFFECT Setting the stage for modern physics…

Quantum Physics Particle Nature of EM Radiation Photoelectric Effect Electronvolt Wave Nature of Particles De Broglie Equation.

Wave Nature of Light and Quantum Theory

Particle Nature of Light page 49 of Notebook VISIBLE LIGHT ELECTRONS.

To Atomic and Nuclear Physics to Atomic and Nuclear Physics Phil Lightfoot, E47, (24533) All these slide presentations are at:

G. Energy of a photon You should be able to: describe the particulate nature (photon model) of electromagnetic radiation state that a photon is a quantum.

Modern Physics Wave Particle Duality of Energy and Matter Is light a particle or a wave? We have see that light acts like a wave from polarization, diffraction,

1 Introduction to quantum mechanics (Chap.2) Quantum theory for semiconductors (Chap. 3) Allowed and forbidden energy bands (Chap. 3.1) What Is An Energy.

By: Conor Donohue and Jen Davis. Waves are everywhere. But what makes a wave a wave? What characteristics, properties, or behaviors are shared by all.

Chapters 30, 31 Light Emission Light Quanta

Wave Particle Duality Chapter 5

Modern Physics Review Get a board, marker, partner, and wipey thing.

I. Waves & Particles (p ) Ch. 5 - Electrons in Atoms yC. JOHANNESSON.

Quantum Theory & the History of Light

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

Photoelectric Effect 31.4 Photoelectric Effect.

Modern Physics Quantum Effects 1773 – 1829 Objectives  Explain the photoelectric effect and recognize that quantum theory can explain it, but wave theory.

PARTICLE NATURE OF LIGHT. A Black Object Appears black because it absorbs all frequencies of light A black block of iron does this.

Electrons and Light. Light’s relationship to matter Atoms can absorb energy, but they must eventually release it When atoms emit energy, it is released.

ELECTROMAGNETIC RADIATION subatomic particles (electron, photon, etc) have both PARTICLE and WAVE properties Light is electromagnetic radiation - crossed.

Modern Atomic Theory Quantum Theory and the Electronic Structure of Atoms Chapter 11.

12.8 Light as Particles: The Photoelectric Effect Einstein expanded on Newton and Planck’s idea of light as particles Einstein expanded on Newton and Planck’s.

History of Atomic Theory … continued…. Problem with Rutherford If electrons are orbiting around a nucleus, they are continuously accelerating. 19th century.

C. Johannesson I. Waves & Particles (p ) Ch. 5 - Electrons in Atoms.

A. Waves  Wavelength ( ) - length of one complete wave  Frequency ( ) - # of waves that pass a point during a certain time period hertz (Hz) = 1/s 

4-2 Quantum Theory. Planck’s Theory Max Planck predicted accurately how the spectrum of radiation emitted by an object changes with temperature.

The Bohr ModelNiels Bohr Violet: nm Indigo: nm Blue: nm Green: nm Yellow: nm Orange:

Aim: How do we calculate the energy of a photon?

MAX PLANCK PHOTOELECTRIC EFFECT © John Parkinson.

What is the nature of Light ? Part II.

Quantum Physics Lesson 1

THEORIES OF LIGHT Is light a wave or a stream of particles?

Can a soccer ball Diffract?

Photoelectric Effect.

ORIGIN OF QUATUM PHYSICS

Quantum Energy and Photoelectric Effect

Unit 11 – Modern Physics.

I. Light and Quantized Energy (Cont.)

Chapter 29: Particles and Waves

Wave/Particle Duality

PHOTOELECTRIC EFFECT hhhhh 12/4/2018.

THE PHOTOELECTRIC EFFECT

I. Waves & Particles (p ) Ch. 4 - Electrons in Atoms I. Waves & Particles (p )

Waves and particles Ch. 4.

Key Areas covered Photoelectric effect as evidence for the particulate nature of light Photons of sufficient energy can eject electrons from the surface.

Ch. 5 - Electrons in Atoms Waves & Particles.

Unit 2 Particles and Waves Photoelectric Effect

Quantum Physics Lesson 1

Presentation transcript:

Wave-Particle Duality All matter can exist in the form of a wave or as a particle. Specific experiments have been used to prove this.

Answer Me!!! Is light a wave or a particle? Justify your answer with specific proof.

Wave or Particle….OR Both? Examples of wave behavior Reflection Refraction Diffraction Interference Polarization Examples of particle behavior Reflection Refraction Photoelectric Effect

The Photoelectric Effect If light consists of tiny particles called “photons” then these particles will be able to interact with other particles.

Results of the Photoelectric Effect The electrons were emitted immediately - no time lag! Increasing the intensity of the light increased the number of photoelectrons, but not their maximum kinetic energy! Red light will not cause the ejection of electrons, no matter what the intensity! A weak violet light will eject only a few electrons, but their maximum kinetic energies are greater than those for intense light of longer wavelengths!

Photoelectric Effect Equation The results show that the Energy of the electron emitted due to the photoelectric effect was directly proportional to the frequency of light incident on the material. E=hf E is Energy h is Planck’s constant (6.63 x 10-34 Js) f is frequency

Practice Problem A green laser with a wavelength of 580 nm is shining on a photosensitive surface. How much energy (in electronvolts) is transferred from the photons to the electrons in the material?