Light Waves Photons Wavelength Changes Energy per photon changes

Slides:



Advertisements
Similar presentations
The Photoelectric Effect
Advertisements

The Photoelectric Effect Key Points. What is it ? Electrons are emitted from zinc when ultraviolet radiation shines on it. Other metals emit electrons.
The Photoelectric Effect Waves as particles? What, are you crazy??
The Photoelectric Effect AP Physics Unit 12. History After Young’s experiment with interference (1830), light was understood to be a wave. Most physicists.
_______________physics 1.Matter is a____________________ 2.Light is a _________________. particle wave Classical This is "everyday" physics that deals.
Waves, Light, Quantum. Figure 4.1: Molar Volume (elements known in 1869) (a few more recently discovered elements added)
Which of the following describes the dual nature of light? 1. Light has a frequency and a wavelength. 2. Light behaves as particle and as wave. 3. Light.
Wavelength, Frequency, and Energy Practice Problems
Light Students will learn about light.. Light Light is a transverse electromagnetic wave. Consider the electric field portion as transverse up and down.
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.
The Photoelectric E ffect By Eleanor Girdziusz. The Photoelectric Effect “The phenomenon that when light shines on a metal surface, electrons are emitted”
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.
Electromagnetic Spectra Review Game. When do electrons emit light? Moving from higher to lower energy levels.
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,
Wave-Particle Duality
Planck’s hypothesis, and Einstein’s photon theory. Contents: Hubris at the turn of the century Black Body radiation The problem with black body radiation.
MIDTERM 1 REVIEW. WAVES: Given that yellow light is about 600 nm and blue light is 500 nm, Which has the higher frequency? Higher energy?
Waves All kinds of waves…. Waves Wave characteristics are the same on matter what type of wave we are dealing with.
Planck’s hypothesis, and Einstein’s photon theory. Contents:
The photoelectric effect To be a wave or a particle? That is the question.
Photons, Electrons, and Atoms. Visible and non-visable light Frequencies around Hz Much higher than electric circuits Theory was about vibrating.
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 31.4 Photoelectric Effect.
Light Introduction General Information. Light is a Wave Exactly as ocean waves, sound waves, slinky waves... Amplitude Wavelength Frequency Wave speed.
Elmo Electron RedOrangeGreenYellowPurpleBlue Parable of A Jailed Electron.
Photoelectric Effect (How Einstein really became famous!)
A. Research the photo electric effect and provide a written explanation of the effect and its importance to modern physics B. Write down the equation for.
PARTICLE NATURE OF LIGHT. A Black Object Appears black because it absorbs all frequencies of light A black block of iron does this.
1 EM wave spectrum Low photon energy High f Low f Long short High photon energy 1 photon has Photon Energy = hf = h c/ n photon has Photon Energy = n hf.
ELECTROMAGNETIC RADIATION subatomic particles (electron, photon, etc) have both PARTICLE and WAVE properties Light is electromagnetic radiation - crossed.
What is a Spectrum? How much of observed light is high energy radiation and how much is low energy radiation.
The Nature of Light The Electromagnetic Spectrum.
C. Johannesson I. Waves & Particles (p ) Ch. 5 - Electrons in Atoms.
4-2 Quantum Theory. Planck’s Theory Max Planck predicted accurately how the spectrum of radiation emitted by an object changes with temperature.
Chapter 5 Light Energy and Electron Configurations.
EMR 2 The Compton Effect. Review of Photoelectric Effect: Intensity Matters - the greater the intensity/brightness, the greater the photoelectric current.
Photoelectric Effect. Lenard 1902: Studied energy of the photoelectrons with intensity of light. He could increase the intensity thousand fold. 1.Noticed.
The Electromagnetic Spectrum
The photoelectric effect Contents: Einstein’s proposed experiment Solving photoelectric problems Example 1 | Example 2Example 1Example 2 Whiteboard Photon.
The photoelectric effect Contents: Einstein’s proposed experiment Solving photoelectric problems Example 1 | Example 2Example 1Example 2 Whiteboard Photon.
The Wacky World of Quantum Physics
Electrons in Atoms Chapter 4.
The Electromagnetic Spectrum and Light
Light’s Wave Nature.
Wave Properties 7SCIENCE.
Speed of light (c) Celeritas = latin for swiftness
Electromagnetic Radiation
Section 5.1 Light and Quantized Energy
4.5 NOTES LIGHT and ENERGY.
Photoelectric Effect.
Mechanical vs. Electromagnetic Waves
The photoelectric effect
Unit 11 – Modern Physics.
Students will learn about light.
Photoelectric Effect Lesson 8.
Waves and Electromagnetic Radiation
Quantum Mechanics & the Nature of Matter, Motion and Reality
I. Waves & Particles (p ) Ch. 4 - Electrons in Atoms I. Waves & Particles (p )
Waves and particles Ch. 4.
The Photoelectric Effect
Light’s Wave Nature.
Quantum Mechanics.
Electron Configurations
4.6 NOTES Atomic Emission Spectra
Ch. 5 - Electrons in Atoms Waves & Particles.
Waves O 1.2 Wave Properties.
Parts of a Wave.
256 nm light strikes a metal and the ejected electrons have a stopping potential of 1.15 V. What is the work function of the metal in eV? (2) E = hf =
Parts of a Wave.
Planck’s hypothesis, and Einstein’s photon theory. Contents:
Presentation transcript:

Light Waves Photons Wavelength Changes Energy per photon changes E = hf Radio Waves vs. X-rays Color small  = blue big  = red Amplitude Changes # of photons changes many = bright few = dim CCD Devices, High speed film small = dim Brightness big = bright

Einstein’s Photon theory predicts: Photon energy = work function + Kinetic energy of electron hf =  + Ekmax Ekmax = hf -  Photon Theory predicts: Ekmax rises with frequency Intensity of light ejects more Wave Theory predicts: Ekmax rises with Amplitude (Intensity) Frequency should not matter Survey says Millikan does the experiment 1915 conclusion 1930 conclusion

Feedback: Privacy Policy Feedback
Do Not Sell My Personal Information
About project: SlidePlayer Terms of Service

© 2025 SlidePlayer.com. Inc. All rights reserved.