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Down The Rabbit Hole: Quantum Physics

Down The Rabbit Hole: Quantum Physics. Lesson 8. Objectives. Objectives. Define a quantum Calculate the energy of a photon Relate photon energy to waveleng th and frequency of EMR . Blackbody Radiation. Stove burner. Blackbody Radiation .

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Down The Rabbit Hole: Quantum Physics

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  1. Down The Rabbit Hole: Quantum Physics Lesson 8

  2. Objectives Objectives • Define a quantum • Calculate the energy of a photon • Relate photon energy to wavelength and frequency of EMR

  3. Blackbody Radiation • Stove burner

  4. Blackbody Radiation • It was known that as one heats an object it changes color. What colors can you name as objects heat up? • The color corresponds to the emission of EMR. As the object gets hotter it should emit greater and greater frequencies of EMR.

  5. Predicted Wavelengths • It was predicted that an ideal blackbody at thermal equilibrium will emit EMR with infinite power under classical physics • However, blackbodies only emit wavelengths of certain color when at certain temperatures as shown by the graph on the next page

  6. Predicted vs. Actual Blackbody Radiation

  7. Ultraviolet Catastrophe • Since values above the visible light region did not occur in increasing amounts as predicted, scientists were at a loss to explain the results and called this the Ultraviolet Catastrophe.

  8. Max Planck • Max Planck resolved this issue by postulating that electromagnetic energy did not follow the classical description • Planck assumed that the energy given off by these objects had to occur in discreet units (bundles) of energy. Each of these bundles had a specific quantity of energy associated with it. He called these units Quanta.

  9. Examples • 1. How much energy does a photon (quantum) with a frequency of 2.00 x 1014 Hz have in J and eV? • 2. What is the wavelength of a photon having 5.97 x 10-15 J of energy? What part of the EMR spectrum is this? • 3. How many photons are given off each second by a green (λ = 555 nm) 60.0 Watt light bulb?

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