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Act_3 - Name Section Activity 3 Electromagnetic Waves...

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12/29/04 1 Name _________________________ Section ___________________ Activity 3: Electromagnetic Waves – Radiant Energy II 3.1 Applications of the Quantum Model of Radiant Energy 1) Photon Absorption and Emission The diagrams below illustrate an atomic nucleus and energy levels of the atom’s electrons (not drawn to scale). Diagram #1 shows a photon incident on an electron in an atom. In diagram #2, an electron in the atom has absorbed a photon and has moved to a higher energy level. Diagram #3 shows the atom emitting a photon of light and dropping to a lower energy level. Diagram #4 shows the same atom some time later, after the electron has emitted a second photon and dropped to an even lower energy level. Answer the questions below based on these diagrams. Time 1: An ultraviolet light photon is Time 2: The electron moves up absorbed by an electron. two energy levels. Time 3: The electron drops down one Time 4: The electron drops down one energy level and emits one more energy level and one photon of visible light. emits a second photon. Nucleus Electron Photon 1 Photon 2 Photon 3
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12/29/04 2 a) Does the absorbed photon #1 or the emitted photon #2 have more energy? ________________ How do you know? b) Which photon has a larger frequency, the absorbed or either of the emitted photons? __________________ How do you know? c) Which photon has a longer wavelength – the absorbed or the emitted photon? _________________ How do you know? d) If the absorbed photon #1 is a photon of blue visible light, what color of light could emitted photon #2 be? e) Compare the energy of photon #1 to the energies of photons #2 and #3. 2) Ultraviolet Light and Fluorescence Your instructor will demonstrate the results of shining several types of radiant energy on fluorescent materials.
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