Down The Rabbit Hole: Quantum Physics

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Presentation transcript:

Down The Rabbit Hole: Quantum Physics Lesson 7

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

Blackbody Radiation Stove burner

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.

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

Predicted vs. Actual Blackbody Radiation

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.

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.

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?