'Threshold frequency' diaporamas de présentation

AS REVISION UNIT 1

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Chapter 7

Chapter 7. Quantum Theory and Atomic Structure. Quantum Theory and Atomic Structure. 7.1 The Nature of Light. 7.2 Atomic Spectra. 7.3 The Wave-Particle Duality of Matter and Energy. 7.4 The Quantum-Mechanical Model of the Atom. The Wave Nature of Light.

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Barnett Shale Fracture Overview

Barnett Shale Fracture Overview. Julia F. W. Gale & Robert M. Reed. Permian Basin Geological Synthesis Project Fracture Research and Application Consortium. Barnett Shale Fracture Overview. Natural opening-mode fractures Core observations Distinguishing natural from induced fractures

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Blackbody Radiation Photoelectric Effect Wave-Particle Duality

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Key Areas covered

Key Areas covered. Photoelectric effect as evidence for the particulate nature of light Photons of sufficient energy can eject electrons from the surface of materials The threshold frequency is the minimum frequency of a photon required for photoemission

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Energy of a photon

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 of energy of electromagnetic radiation select and use the equations for the energy of a photon: E = hf and E = hc / ?

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*Use the light kits at your tables to perform and a nswer the following:

QW. *Use the light kits at your tables to perform and a nswer the following: Shine red, blue, and green lights at glow in the dark material 1. Which one makes the glow in the dark work the best? 2. Which is the worst? 3. Which is in the middle?. The blue light has the most energy

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History of Atomic Theory

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Aim: How can we apply mathematics to the photoelectric effect?

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 of the ejected electrons?. Increase intensity of the wave Increase frequency of the wave.

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Quantum Theory

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Photoelectricity

Photoelectricity. Quantum Physics Lesson 1. Comment made circa 1900 (Believed to be from Lord Kelvin). "There is nothing new to be discovered in physics now. All that remains is more and more precise measurement" . Learning Objectives.

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TITULO

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TITULO

TITULO. Autores. Blackbody?. A material is constantly exchanging heat with its surrounding (to remain at a constant temperature ): It absorbs and emits radiations

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The Photoelectric E ffect

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Photons & The Photoelectric Effect

Photons & The Photoelectric Effect. Blackbody Radiation. All objects emit electromagnetic waves as a function of heat energy A perfect blackbody emitter will absorb and reemit all of the electromagnetic radiation that fall on it. Blackbody Radiation.

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scienceblogs

Black Body Radiation: Refresher. T= temperature in kelvin l max = wavelength of maximum intensity in mm. scienceblogs.com. Black Body Radiation. Blackbody radiation depends only on temperature of object. scienceblogs.com.

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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 with other kinds of radiation. Why was it a problem ?.

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Photoelectric Effect: A second look at the equation

Photoelectric Effect: A second look at the equation. E k = h? - ?. y = mx + b. Before threshold frequency no kinetic energy is present After threshold frequency the relationship is linear.

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