Both We call this the “Dual Nature of Light”

Slides:

Advertisements

Similar presentations

WHAT IS ENERGY? ABILITY TO DO WORK MEASURED IN JOULES (J)

Advertisements

Lecture Outline Chapter 30 Physics, 4th Edition James S. Walker

Universe Eighth Edition Universe Roger A. Freedman William J. Kaufmann III CHAPTER 5 The Nature of Light CHAPTER 5 The Nature of Light.

The Photoelectric Effect Waves as particles? What, are you crazy??

Knight - Chapter 28 (Grasshopper Book) Quantum Physics.

Waves no matter what type, all have properties. Height is a property of waves no matter if it’s a ripple in a glass or a giant wave at the beach, it can.

Light-particle or wave Particles- bounce, move by collisions, cause other things to move, have mass, momentum, travel in straight lines properties depend.

Chapter 10: Waves Wave concepts  A wave is a “disturbance” that travels (usually through a medium).  They carry energy away from a source.  The disturbance.

Light Students will learn about light.. Light Light is a transverse electromagnetic wave. Consider the electric field portion as transverse up and down.

Pre-IB/Pre-AP CHEMISTRY

The dual nature of light l wave theory of light explains most phenomena involving light: propagation in straight line reflection refraction superposition,

Light is energy that travels in electromagnetic waves, meaning it can travel through a medium (matter) or through a vacuum (empty space). The speed of.

Quantum Mechanics 101 Waves? or Particles? Interference of Waves and the Double Slit Experiment  Waves spreading out from two points, such as waves.

Classical vs Quantum Mechanics Rutherford’s model of the atom: electrons orbiting around a dense, massive positive nucleus Expected to be able to use classical.

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.

Co Chapter 7 Light. High frequency → High energy Low energy → low frequency Fig. 7.3 Speed of light = 3.0 x 10 8 m/s Electromagnetic radiation.

Index Unit 03 Electron Configuration Module 02: Light as a Particle Based on the PowerPoints By Mr. Kevin Boudreaux, Angelo State Univerisity U03Mod01.

P. Sci. Unit 5 Waves Chapter 17.

Waves PSC1341 Chapter 4. Waves A wave is a repeating disturbance or movement that transfers energy through matter or space Waves can be mechanical and.

2 classes of waves compressiontransverse Wave Behavior  All waves will Reflect Refract Diffract Interfere.

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,

Waves and Wave Interactions

Bill Nye: Waves Bill Nye: Waves Waves, Sound, & Light Energy.

Thompson’s experiment (discovery of electron) + - V + - Physics at the end of XIX Century and Major Discoveries of XX Century.

Physics Review Day 3. Waves A wave is a repetitive motion that transfers energy through matter or space There are two types of waves: –Transverse –Longitudinal.

Chapter 22 Objectives Describe reflection, refraction, diffraction, and interference. Compare destructive interference with constructive interference.

Light - an ___________________ wave (EM wave). It can travel without a _______________. It can travel through _______ or _______________ and consists.

PowerPoint Lectures to accompany Physical Science, 7e Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Chapter.

I Love Lucy Airs for First Time (1951) READING: reread chapter 7 READING: reread chapter 7 HOMEWORK – DUE TUESDAY 10/20/15 HOMEWORK – DUE TUESDAY 10/20/15.

Photoelectric Effect (How Einstein really became famous!)

Development of a New Atomic Model Properties of Light.

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

Solids and Light – Introduction to Light

Chapter 14: Waves Section 1: Types of Waves. Most of us picture waves of water splashing on a shore when we hear the word… However, waves are found in.

Chapter 1 Section 3 t-catch-the-physics-of-waves.html.

6.1 The Dual Nature of Light Chemistry Ms. Pollock

Plan for Today (AP Physics 2) Ch 24, 27, and 28 Review Day More Review Materials.

The Nature of Light The Electromagnetic Spectrum.

Reflection happens when a wave bounces back after hitting a barrier. All waves-including water, sound, and light waves-can be reflected.

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

 Read through your lab packet.  Take only the following with you: ◦ Lab packet ◦ Writing utensil(s) ◦ Blank sheet of paper  You will have about 10.

LIGHT: What Is It? Light Energy –Atoms As atoms absorb energy, electrons jump out to a higher energy level. Electrons release light when falling down to.

Light Continued. The light models explain how we… See ____________ See ______________ in objects ______ see around corners See ________ distant objects.

Introduction to Physics and Astronomy (1) 2-1. Light and Black Body Radiation.

The Electromagnetic Spectrum and Light

Waves, Sound, & Light Energy

Wave Particle Duality.

Chapter 6 Electronic Structure of Atoms

Lesson 1: The Nature of Electromagnetic Waves

Light: Electromagnetic Spectrum

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

Light Big Idea: Electromagnetic Radiation, which includes light, is a form of radiant energy possessing properties of both waves and zero-mass particles.

Light Continued.

The Electromagnetic Spectrum and the Model of the Atom Part I

Wave Interactions.

Chapter 20 The Energy of Waves.

A history of atomic structure

How do waves travel.

Light and Energy Electromagnetic Radiation is a form of energy that is created through the interaction of electrical and magnetic fields. It displays wave-like.

Electromagnetic Radiation

Properties of Waves Part 2.

Waves 7th 2.3 Wave Behavior.

Light Wave or Particle?.

Presentation transcript:

Both We call this the “Dual Nature of Light” Light Wave or Particle? Both We call this the “Dual Nature of Light”

Evidence Wave Properties Interference of Light Particle Properties

When two light waves hit they pass through each other. Interference of Light When two light waves hit they pass through each other. While they occupy the same space the waves combine amplitudes and frequencies to produce a different wave. This is called interference. If two particles hit they bounce off each other. They don’t interfere like waves.

Refraction & Dispersion Evidence Wave Properties Interference Refraction & Dispersion Particle Properties

Refraction & Dispersion of Light When light enters glass it bends. This is called refraction How much light refracts depends on the type of glass and the color of light. A particle could refract, wave theory works better. When white light enters glass the different frequencies bend differently. This causes the light to split into the rainbow. This is called dispersion. Particles wouldn’t display dispersion.

Refraction & Dispersion Evidence Wave Properties Interference Refraction & Dispersion The Doppler Effect Particle Properties

The Doppler Effect for Light When a light source is moving the frequency of light it emits changes due to this motion. A particle doesn’t do this, only a wave.

Refraction & Dispersion Evidence Wave Properties Interference Refraction & Dispersion The Doppler Effect Diffraction Particle Properties

Diffraction of Light You get a broken line, called a diffraction pattern. Basically the light bends as it passes through the slit causing an alternating series of constructive and destructive interference. A particle wouldn’t do this. A single point? Or a broken line? If I fire this laser through a small slit, what will I see on the wall when it hits?

Refraction & Dispersion Evidence Wave Properties Interference Refraction & Dispersion The Doppler Effect Diffraction SO… Light is a Wave!!!!!!!!!!!! Particle Properties

OR IS IT??

Refraction & Dispersion The Photoelectric Effect Evidence Wave Properties Interference Refraction & Dispersion The Doppler Effect Diffraction SO… Light is a Wave!!!!!!!!!!!! Particle Properties The Photoelectric Effect

The Photoelectric Effect When light hits certain metals it causes the metal to eject electrons. Treating light as a wave tells us that the brighter the light, the more electrons get ejected or the electrons get ejected at a faster speed. This would be true if it wasn’t false!!! It turns out the frequency of the light is what determines whether or not electrons are ejected from the metal. This suggests that light travels in quanta or packets called photons which behave like particles.

Evidence SO… Light is a Wave!!!!!!!!!!!! Wave Properties Interference Refraction & Dispersion The Doppler Effect Diffraction SO… Light is a Wave!!!!!!!!!!!! Particle Properties The Photoelectric Effect The Ultraviolet Catastrophe

The Ultraviolet Catastrophe A blackbody radiator absorbs all electromagnetic radiation that hits it and emits its own electromagnetic radiation based on its temperature. Wave theories predict that the wavelengths of electromagnetic waves a blackbody will emit should follow the relationship shown by the dashed curve in the graph. It turns out that experiments show that the wavelength of electromagnetic waves emitted by a blackbody actually follow the solid curves shown in the graph called blackbody curves. Which curve is determined by the temperature of the blackbody.

Our Sun’s Blackbody Curve

The Ultraviolet Catastrophe This also suggests that light travels in quanta or packets called photons which behave like particles.

???????????????????? Evidence SO… Light is a Particle!!!!!!!!!!!! Wave Properties Interference Refraction & Dispersion The Doppler Effect Diffraction SO… Light is a Wave!!!!!!!!!!!! Particle Properties The Photoelectric Effect The Ultraviolet Catastrophe SO… Light is a Particle!!!!!!!!!!!! ????????????????????

The dual nature of light Light is a wave Light is also a particle Light travels in packets of waves called photons. These photons act like particles and waves depending on what is being observed. The energy of each of these photons depends on the frequency of the contained wave.