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Isotope characteristics differ U U
Binding energy Energy released when a nucleus is formed from protons and neutrons. Mass is lost. E = mc 2 –where m is the lost mass
The photon A “particle” of light A “quantum” of light energy The energy of a given photon depends on the frequency (color) of the light
But light is also a wave! Travels at constant speed c in a vacuum. c = f –c: 3 x 10 8 m/s – wavelength (m) – f: frequency (Hz)
Calculating photon energy E = hf –E: energy (J or eV) –h: Planck’s constant J s or 4.14 eV s –f: frequency of light (s -1, Hz)
The “electron-volt” (eV) is an energy unit Useful on the atomic level. If a moving electron is stopped by 1 V of electric potential, we say it has 1 electron-volt (or 1 eV) of kinetic energy!
Converting eV to Joules (J) 1 eV = J
Absorption Spectrum Photon is absorbed and excites atom to higher quantum energy state. 0 eV -10 eV hf Ground state EE
Absorption Spectrum Absorption spectra always involve atoms going up in energy level. 0 eV -10 eV ionized
Emission Spectrum Photon is emitted and atom drops to lower quantum energy state. 0 eV -10 eV hf Excited state EE
Emission Spectrum Emission spectra always involve atoms going down in energy level. 0 eV -10 eV ionized
Wavelength Photon – = c/f Particle – = h/p – deBroglie wavelength
Compton Scattering Proof of the momentum of photons. High-energy photons collided with electrons. Conservation of momentum. Scattered photons examined to determine loss of momentum.
Davisson-Germer Experiement Verified that electrons have wave properties by proving that they diffract. Electron diffraction
The photon A “particle” of light A “quantum” of light energy The energy of a given photon depends on the frequency (color) of the light.
THE COMPTON EFFECT Energy and momentum are conserved when a photon collides with an electron.
Nuclear Physics. Quantum Physics Physics on a very small (e.g., atomic) scale is “quantized”. Quantized phenomena are discontinuous and discrete, and.
Light Waves and Particle Characteristics. Parts of a Wave = wavelength (lambda) =frequency(nu)
Chemistry – Chapter 4. Rutherford’s Atomic Model.
Chemistry Notes: Electromagnetic Radiation. Electromagnetic Radiation: is a form of energy that exhibits wavelike behavior as it travels through space.
Chapter 27- Atomic/Quantum Physics. The Sun Why do we see the sun as yellow instead of green or blue or pink?
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,
Radiant Energy particles or waves of energy emitted Electromagnetic radiation – energy released from all objects Nuclear radiation – energy released.
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.
Electrons in Atoms The Development of a New Atomic Model.
What is light? Is it a wave, or a particle? Light is a wave… –It reflects off surfaces, and refracts through mediums. –Light has a frequency, and wavelength.
Section 1 The Development of a New Atomic Model Objectives Explain the mathematical relationship among the speed, wavelength, and frequency of electromagnetic.
Electrons in Atoms 13.3 Physics and the Quantum Mechanical Model 13.1 Models of the Atom Atomic orbitals 13.2 Electron Arrangement in Atoms.
Quantization of Energy. When the atom gets excited… To help visualize the atom think of it like a ladder. The bottom of the ladder is called GROUND STATE.
_______________physics 1.Matter is a____________________ 2.Light is a _________________. particle wave Classical This is "everyday" physics that deals.
The shorter the wavelength ( ), the higher the frequency ( ). Energy of the wave increases as frequency increases.
Wave Particle Duality Photoelectric Effect. Waves and Particles So far this year, we have treated waves and particles as if they are separate entities.
Physics 6.5. Quantum Theory Atoms can only give off or absorb a discrete amount of energy. This energy is given off or absorbed as light or electromagnetic.
e-e- E n eV n = 1 ground state n = 3 0 n = ∞ n = n = 4 ionisation N.B. All energies are NEGATIVE. REASON: The maximum energy.
Atomic Structure I It’s not about Dalton anymore…
Modern Physics Previously we showed that Light behaves like sound. It has characteristics of waves Now we get to see how it also behaves like a particle.
Electrons, Energy, and Light Waves. When electrons are in the lowest possible energy levels, they are in their ground state.
Preview Objectives Properties of Light Wavelength and Frequency The Photoelectric Effect The Hydrogen-Atom Line-Emission Spectrum Bohr Model of the Hydrogen.
I II III Suggested Reading Pages Section 4-1 Radiant Energy.
Modern Atomic Theory Quantum Theory and the Electronic Structure of Atoms Chapter 11.
Chapter 4 © Houghton Mifflin Harcourt Publishing Company Section 1 The Development of a New Atomic Model Properties of Light The Wave Description of Light.
Light Quantized energy Quantum theory and the atom.
Light 1)Electrons (charged –1 each, with a mass of 1/1836 amu each) surround the nucleus of the atom in distinct energy levels. Electrons occupy the.
E = hf E – energy of a quantum (Joules) h – Plank’s constant (6.626 x J s) f – frequency of absorbed or emitted EMR.
Wavelength, Frequency, and Planck’s Constant. Formulas 1)E = hf E = energy (Joules J) h = Planck’s constant = 6.63 x J x s f = frequency (Hz) 2)
Arrangement of Electrons in Atoms The Development of a New Atomic Model.
Chemistry I Chapter 4 Arrangement of Electrons. Electromagnetic Radiation Energy that exhibits wavelike behavior and travels through space Moves at the.
Wave-Particle Duality: The Beginnings of Quantum Mechanics.
NCCS & Properties of Light The Wave Description of Light Electromagnetic radiation is a form of energy that exhibits wavelike behavior.
1 …a mad scientist’s guide… atomic excitation and ionisation.
Quantum Mechanical Ideas. Photons and their energy When electromagnetic waves are exhibiting their “particle-like” nature, we call those little mass-less.
Electromagnetic Radiation. Properties of E-M Radiation All electromagnetic radiation has the following common properties: 1.It is energy and has no mass.
Let There Be Light…Explained! Electron Configuration Introduction 1.
Aim: How can we explain energy transitions in an atom? Do Now: What were the limitations of the Rutherford model of the atom and how did the Bohr model.
Chapter 7. Electromagnetic Radiation aka. Radiant energy or light A form of energy having both wave and particle characteristics Moves through a.
Day 1 Modern Physics NOTE: each topic is sectioned into “days” numbered from 1 to 7. This would be a good pace to follow as you make your way through the.
1 Modern Chemistry Chapter 4 Arrangement of Electrons in Atoms Sections 1-3 The Development of a New Atomic Model The Quantum Model of the Atom Electron.
Chem-To-Go Lesson 7 Unit 2 ENERGY OF ELECTRONS. ENERGY BASICS All energy travels in the form of a wave. Scientists measure the wavelength of a wave to.
ELECTROMAGNETIC RADIATION AND THE NEW ATOMIC MODEL.
Astronomy 100 Tuesday, Thursday 2:30 - 3:45 pm Tom Burbine
The Development of a New Atomic Model Problem with Rutherford model – no explanation of where e-s are New info about light led to new model.
Bellwork What is the majority of the volume of an atom?
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