# Light2 - 1 Sun emits most strongly at these wavelengths 2...

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Light: Properties and Temperature Spectrum and more properties When we divide up all the types of electromagnetic radiation by wavelength (color), we  get a " spectrum ". The study of light at different wavelengths is called " spectroscopy ". It is a very  powerful tool.  RED . . . . . BLUE RADI O INFRARE D VISIB LE ULTRAVIOLE T X- RAYS GAMMA  RAYS low ---------------------------------------> frequency -----------------------------------------------> high long <-------------------------------------- wavelength <----------------------------------------------  short  See Figure 3.5 in the textbook for another description of a spectrum.   Visible light is actually a very small part of the spectrum. We can see the colors within the sunlight because each color is bent differently when it  passes through a prism.  Why do we see "visible" light ?

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Unformatted text preview: 1. Sun emits most strongly at these wavelengths 2. Earth's atmosphere blocks many other wavelengths 3. Human eye efficiently detects available light. 4. Is light really a wave ? • sometimes light acts like a particle - "photon" • sometimes light acts like a wave • it is really both - or neither - we just don't have the right words to describe it completely Energy carried by light depends on wavelength (color, frequency): • short wavelength => more energy • long wavelength => less energy o blue light carries more energy than red light x-rays carry more energy than radio waves Mathematically, we can express this as: E = hc / λ where E is the energy, λ is the wavelength, and h anc c are constant numbers....
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## This note was uploaded on 03/09/2012 for the course AST 1002 taught by Professor Emilyhoward during the Spring '10 term at Broward College.

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Light2 - 1 Sun emits most strongly at these wavelengths 2...

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