wavesOpt

wavesOpt - WAVES SOUND& LIGHT Waves carry energy from...

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Unformatted text preview: WAVES: SOUND & LIGHT Waves carry energy from one place to another © 2000 Microsoft Clip Gallery 100’s of free ppt’s from www.pptpoint.com library 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. Uses: Medicine – Bones absorb x-rays; soft tissue does not. Lead absorbs X-rays. Electromagnetic Spectrum Invisible spectrum (cont.) Gamma rays Def. Highest frequency EM waves; Shortest wavelength....
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This note was uploaded on 11/17/2011 for the course PHYS 121 taught by Professor Burgeson during the Fall '11 term at BYU.

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wavesOpt - WAVES SOUND& LIGHT Waves carry energy from...

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