UH PHYS 1302 - Exam3Review (6 pages)

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Exam3Review



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Exam3Review

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exam 3 review


Pages:
6
School:
University of Houston
Course:
Phys 1302 - Introductory to Physics II

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Exam 3 Review Chapter 30 Quantum Physics A blackbody is an object that perfectly absorbs and perfectly emits radiation The distribution of frequencies in blackbody radiation only depends on the temperature it does not depend on what the blackbody is made of Light of frequency f consists of photons that each have an energy E hf The more photons in a beam of light the higher the intensity of the light Photoelectric Effect A beam of light incident on a metal surface can cause electrons to be ejected A single photon is responsible for each electron that is ejected The minimum amount of energy necessary to eject an electron is called the work function W0 The energy of a photon must be at least as much as the work function to eject an electron This defines a minimum frequency for the incoming light to eject an electron f0 W0 h If the energy of the incident photon is greater than the work function the excess energy goes into kinetic energy of the ejected electron The maximum kinetic energy the ejected electron can have is given by Kmax hf W0 Increasing the intensity of the incident light means more photons hit the metal per second thus more electrons can be ejected Remember the momentum of a photon is given by p E c h When an X ray photon undergoes a collision with an electron initially at rest the photon is scattered changing its direction and energy Since the energy of the photon changes so does the wavelength and frequency The change in the wavelength 1 difference in the wavelength before and after the collision can be calculated given the scattering angle of the photon Energy and momentum are conserved in this interaction Light can exhibit both wave like and particle like properties Particles can also exhibit wave like properties The de Broglie wavelength of a particle is given by h p The de Broglie wavelengths of everyday objects like people and baseballs is so small that we don t notice the wave like properties of these objects The de Broglie wavelength of an



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