AS101 Study Guide - Hubble Space Telescope, Chromatic Aberration, Electromagnetic Spectrum

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Light and telescopes our window on the universe. The warmth of sunlight reminds us that light is a form of energy. Energy can take many forms and can be converted from one form to another. Some other forms of energy: kinetic energy (energy of motion), heat, sound, chemical energy, etc . When light from the sun warms the ground or your skin, light energy is being converted into heat. Solar power plants convert light into electrical energy. 1 joule of energy is enough to: stat a 1-kg object moving at 1m/s, heat up 1 gram of water by approx 0. 25 degrees c. Watts are a unit of power: energy per unit time: 1 watt = 1 joule/sec. so: A 100w light bulb is using 100 joules per second (only part of that energy is actually emitted as light the rest of it mostly becomes heat. Intensity of light can be measured in w/m^2.