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Word Count: 893
LIGHT A FUNDAMENTAL FORCE IN OUR WORLDIf asked what light is one could say that its one of the most basicelements of our world and our universe as we perceive it It is throughsight that we receive 90 of our information It is through the use oftelescopes aiding the naked eye that we are aware of the heavenly bodiesaround us It is through light that the energy from the sun is transferredto us The suns energy supports the food chain plants use it to turnwater and CO2 into energy usable by other organisms Solar energy was alsoused indirectly to produce all of the fossil fuels that we consume dailySince light is such a basic part of our existence we should have a basicWhat we call light the intangible powerful force that powers our worldis somewhat hard to define in real terms It shares properties with bothparticles and waves It follows the same rules as a wave does--it moves ina regular fashion in a perfect sine wave at a certain frequency Ittravels in a straight line and is subject to refraction All of thesecharacteristics are found in waves of any type from radio frequency wavesup to Gamma and X- rays Light however also exhibits qualitiescharacteristic of particles such as neutrons and protons A photon orquanta is the packet of energy that is sent in a light wave Like aparticle the photon is believed to have a finite mass and has the abilityto affect other matter As light strikes a photovoltaic solar cell itknocks electrons in the silicon atoms on the surface into a higher state ofenergy When these return to their normal or ground state energy isproduced in the form of electricity Thus light is termed awave-particle and this property is called the wave-particle duality ofnature Many questions concerning what makes up light still lieunanswered but this much is thought to be trueLight can be produced in a variety of ways Our sun like other starsuses
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