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PHYS 183 (51)
Tracy Webb (12)
Chapter 5

Chapter 5

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PHYS 183
Tracy Webb

5 Light and Matter51 Light in Everyday Lifewhen you look around you see light not objectsinterpret lightturn it into information about objectslight is a form of energyradiative energy power the rate of energy flow measured in wattspower of 1 watt means energy flow of 1 jouleslight comes in different formscoloursspectrum prism that splits light into the rainbow of lightwe see white when basic colours mixed in roughly equal proportionswe see black when there is no light and therefore no colourprimary colours of vision red green blue are directly detected by cells in eyes colours look different on paper so there is an alternate set of primary colours red yellow bluediffraction grating piece of plastic or glass etched with many closely spaced lines light interacts with matter in 4 basic ways o emission a light bulb emits visible light the energy of the light comes from electrical potential energy supplied to the light bulb o absorption when you place your hand near an incandescent light bulb your hand absorbs some of the light and this absorbed energy warms your hand o transmission some forms of matter transmit light which means allowed it to pass through o reflectionscattering light can bounce off matter leading to reflection bouncing is all in the same general direction or scattering bouncing is more randommaterials that transmit lighttransparent materials that absorb lightopaque materials affect different colours of light differentred glass transmits red green lawn reflect greenwhat into roomturn on light bulb it emits white lightsome is transmitted out the windows the rest strikes surface of objects inside room material properties determine colours it absorbsreflectslight from each other carries information about location shape structure composition all acquired when light enters your eyespecial cells in retina absorb itsend signals to brainbrain interprets messages light carries recognizing materialsobjects through visionlight can be broken down farther than what the eye can see52 Properties of LightIsaac Newton proved colour is from light not prismsa particle is a thing a wave is a pattern characterize waves with 3 basic properties o wavelength distance from one peak or trough to the next
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