Light and Spectra
Light and Spectra AST 101 - M001
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AST 101 - M001
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This 0 page Class Notes was uploaded by Mitchell Jones on Sunday December 6, 2015. The Class Notes belongs to AST 101 - M001 at Syracuse University taught by C. Armendariz-Picon in Fall 2015. Since its upload, it has received 35 views. For similar materials see Our Corner of the Universe in Astronomy at Syracuse University.
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Date Created: 12/06/15
Light Light is electromagnetic radiation wave of electric and magnet fields Light produced by moving electric charges electrons Light changes motion of electric charges Related to electric and magnetic fields Light can be thought of as both wave and particle Light as a wave Wavelength distance between adjacent creststroughs Frequency of troughscrests that pass through a point each second measured in Hertz Hzlsec Speed how fast a crest moves forward measured in ms Speed of wavewavelengthfrequency Speed of light c310quot8 ms Longer wavelength means lower frequency inverse relationship Light as particle Can also think of light as a beam of particles photons Each photon has welldefined energy Energy E of each photon is proportional to its frequency v Ehv h is constant Proposed by Albert Einstein Colors of light Mix of different colors frequencies Sorting out colors creates a spectrum uses a prism Matter and Spectra Matter made of atoms Suggested by Greek philosopher Demoritus 460370 BCE Individual indivisible atoms Atoms known to be divisible now Atoms all matter we are familiar with Nucleus contains the protons and neutrons Cloud of electrons Losing atoms causes ionization Quantum mechanics cannot tell where electron is in cloud they travel too fast and create cloud Isotopes same atoms different number of neutrons and atomic mass same of protons Light and Matter Light moves straight until it hits something Re ects specific direction change comes off at same angle like a mirror Scatters random direction all different angles like snow Snow scatters all wavelengths Colored items green tree re ect only that color green All other wavelengths absorbed Light transmitted through window 3 types of spectra Continuous produced by hot and dense body From the form of spectrum we can infer the temperature of hot body All wavelengths represented all colors Emission produced by hot and dilute gas From emission lines we can infer chemical composition of the gas Absorption cold and dilute gas in front of hot and dense body Can infer the chemical composition of dilute gas and temp of hot body