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How to Use This Presentation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Resources Chapter Presentation Transparencies Sample Problems Visual Concepts Standardized Test Prep

Table of Contents ,[object Object],[object Object],[object Object],Atomic Physics Chapter 21

Objectives ,[object Object],[object Object],[object Object],Section 1 Quantization of Energy Chapter 21

Blackbody Radiation ,[object Object],Section 1 Quantization of Energy Light enters this hollow object through the small opening and strikes the interior wall. Some of the energy is absorbed, but some is reflected at a random angle. After many reflections, essentially all of the incoming energy is absorbed by the cavity wall. ,[object Object],Chapter 21

Blackbody Radiation, continued ,[object Object],[object Object],Chapter 21 Section 1 Quantization of Energy

Blackbody Radiation Chapter 21 The graph on the left shows the intensity of blackbody radiation at three different temperatures. Classical theory’s prediction for blackbody radiation (the blue curve) did not correspond to the experimental data (the red data points) at all wavelengths, whereas Planck’s theory (the red curve) did. Section 1 Quantization of Energy

Blackbody Radiation and the Ultraviolet Catastrophe Chapter 21 Section 1 Quantization of Energy

Quantum Energy ,[object Object],Chapter 21 E = hf energy of a quantum = Planck’s constant  frequency Planck’s constant ( h ) ≈ 6.63  10 –34 J•s ,[object Object],Section 1 Quantization of Energy

Quantum Energy ,[object Object],[object Object],[object Object],[object Object],[object Object],Chapter 21 Section 1 Quantization of Energy

Energy of a Photon Chapter 21 Section 1 Quantization of Energy

The Photoelectric Effect ,[object Object],[object Object],[object Object],Chapter 21 Section 1 Quantization of Energy

The Photoelectric Effect Chapter 21 Section 1 Quantization of Energy

The Photoelectric Effect, continued ,[object Object],[object Object],[object Object],Chapter 21 Section 1 Quantization of Energy

The Photoelectric Effect, continued ,[object Object],maximum kinetic energy of a photoelectron KE max = hf – hf t maximum kinetic energy = (Planck’s constant  frequency of incoming photon) – work function Chapter 21 Section 1 Quantization of Energy

Compton Shift ,[object Object],[object Object],[object Object],[object Object],Chapter 21 Section 1 Quantization of Energy

Compton Shift Chapter 21 Section 1 Quantization of Energy

Objectives ,[object Object],[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Early Models of the Atom ,[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Early Models of the Atom, continued ,[object Object],[object Object],Section 2 Models of the Atom ,[object Object],Chapter 21

Rutherford’s Gold Foil Experiment Section 2 Models of the Atom Chapter 21

Early Models of the Atom, continued ,[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Early Models of the Atom, continued ,[object Object],Section 2 Models of the Atom ,[object Object],[object Object],Chapter 21

Atomic Spectra ,[object Object],Section 2 Models of the Atom ,[object Object],[object Object],Chapter 21

Atomic Spectra, continued ,[object Object],[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Emission and Absorption Spectra of Hydrogen Section 2 Models of the Atom Chapter 21

The Bohr Model of the Hydrogen Atom ,[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

The Bohr Model, continued ,[object Object],Section 2 Models of the Atom ,[object Object],[object Object],Chapter 21

The Bohr Model, continued ,[object Object],[object Object],Section 2 Models of the Atom ,[object Object],[object Object],Chapter 21

The Bohr Model of the Atom Section 2 Models of the Atom Chapter 21

Sample Problem ,[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Sample Problem, continued ,[object Object],[object Object],[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Sample Problem, continued ,[object Object],[object Object],Section 2 Models of the Atom Chapter 21

Sample Problem, continued ,[object Object],Section 2 Models of the Atom 2. Use Planck’s equation to find the frequency. Chapter 21

Sample Problem, continued Section 2 Models of the Atom ,[object Object],Examination of the diagram shows that the electron’s jump from energy level E 4 to energy level E 2 corresponds to Line 3 in the emission spectrum. Chapter 21

Sample Problem, continued Section 2 Models of the Atom 4. Evaluate your answer. Line 3 is in the visible part of the electromagnetic spectrum and appears to be blue. The frequency f = 6.15  10 14 Hz lies within the range of the visible spectrum and is toward the violet end, so it is reasonable that light of this frequency would be visible blue light. Chapter 21

[object Object],[object Object],[object Object],[object Object],The Bohr Model, continued Section 2 Models of the Atom Chapter 21

Objectives ,[object Object],[object Object],[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

The Dual Nature of Light ,[object Object],[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

The Dual Nature of Light, continued ,[object Object],[object Object],[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

The Dual Nature of Light Section 3 Quantum Mechanics Chapter 21

Matter Waves ,[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

Matter Waves, continued ,[object Object],Section 3 Quantum Mechanics ,[object Object],Chapter 21

De Broglie and the Wave-Particle Nature of Electrons Section 3 Quantum Mechanics Chapter 21

The Uncertainty Principle ,[object Object],[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

The Uncertainty Principle Section 3 Quantum Mechanics Chapter 21

The Electron Cloud, continued ,[object Object],[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

The Electron Cloud ,[object Object],[object Object],Section 3 Quantum Mechanics Chapter 21

Multiple Choice ,[object Object],[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Multiple Choice, continued ,[object Object],[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Multiple Choice, continued ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Multiple Choice, continued ,[object Object],[object Object],Standardized Test Prep Chapter 21 7. What is the frequency of the photon emitted when an electron jumps from E 5 to E 2 ? A. 2.86 eV B. 6.15  10 14 Hz C. 6.90  10 14 Hz D. 4.31  10 33 Hz

Multiple Choice, continued ,[object Object],[object Object],Standardized Test Prep Chapter 21 8. What frequency of photon would be absorbed when an electron jumps from E 2 to E 3 ? F. 1.89 eV G. 4.56  10 14 Hz H. 6.89  10 14 Hz J. 2.85  10 33 Hz

Short Response ,[object Object],Standardized Test Prep Chapter 21

Short Response ,[object Object],[object Object],Standardized Test Prep Chapter 21

Short Response, continued ,[object Object],Standardized Test Prep Chapter 21

Short Response, continued ,[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Short Response, continued ,[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Short Response, continued ,[object Object],[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Extended Response ,[object Object],Standardized Test Prep Chapter 21

Extended Response ,[object Object],[object Object],Standardized Test Prep Chapter 21

Extended Response, continued ,[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Extended Response, continued ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Extended Response, continued ,[object Object],[object Object],[object Object],Standardized Test Prep Chapter 21

Atomic Spectra Section 2 Models of the Atom Chapter 21

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