p6 - WAVES: SOUND & LIGHT Waves carry energy...

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Unformatted text preview: WAVES: SOUND & LIGHT Waves carry energy from one place to another 2000 Microsoft Clip Gallery NATURE OF WAVES Waves (Def.) A wave is a disturbance that transfers energy. Medium Substance or region through which a wave is transmitted. Speed of Waves Depends on the properties of the medium. 2000 Microsoft Clip Gallery SAMPLE LESSON: Light & the Electromagnetic Spectrum By D. L. Power Revised 1/20/01 2000 Microsoft Clip Gallery Albert Einstein LIGHT: What Is It? Light Energy Atoms As atoms absorb energy, electrons jump out to a higher energy level. Electrons release light when falling down to the lower energy level. Photons - bundles/packets of energy released when the electrons fall. Light: Stream of Photons 2000 Microsoft Clip Gallery 2000 Microsoft Clip Gallery Electromagnetic Waves Speed in Vacuum 300,000 km/sec 186,000 mi/sec Speed in Other Materials Slower in Air, Water, Glass 2000 Microsoft Clip Gallery Transverse Waves Energy is perpendicular to direction of motion Moving photon creates electric & magnetic field Light has BOTH Electric & Magnetic fields at right angles! 2000 Microsoft Clip Gallery Electromagnetic Spectrum 2000 Microsoft Clip Gallery Electromagnetic Spectrum Visible Spectrum Light we can see Roy G. Biv Acronym for Red , Orange , Yellow , Green , Blue , Indigo , & Violet. Largest to Smallest Wavelength. Electromagnetic Spectrum Invisible Spectrum Radio Waves Def. Longest wavelength & lowest frequency. Uses Radio & T.V. broadcasting. 2000 Microsoft Clip Gallery Modulating Radio Waves Modulation - variation of amplitude or frequency when waves are broadcast AM amplitude modulation Carries audio for T.V. Broadcasts Longer wavelength so can bend around hills FM frequency modulation Carries video for T.V. Broadcasts 2000 Microsoft Clip Gallery Short Wavelength Microwave Invisible Spectrum (Cont.) Infrared Rays Def Light rays with longer wavelength than red light. Uses: Cooking, Medicine, T.V. remote controls Electromagnetic Spectrum Invisible spectrum (cont.). Ultraviolet rays. Def. EM waves with frequencies slightly higher than visible light Uses: food processing & hospitals to kill germs cells Helps your body use vitamin D. Electromagnetic Spectrum Invisible Spectrum (Cont.) X-Rays Def. - EM waves that are shorter than UV rays....
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This note was uploaded on 02/12/2011 for the course PHY 2004 taught by Professor Staff during the Spring '08 term at University of Florida.

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p6 - WAVES: SOUND & LIGHT Waves carry energy...

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