Chapter 24 Studying the Sun Section 1 The Study of Light Notes 24-1

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<ul><li> Slide 1 </li> <li> Chapter 24 Studying the Sun Section 1 The Study of Light Notes 24-1 </li> <li> Slide 2 </li> <li> Vocabulary Electromagnetic spectrum Photon Spectroscopy Continuous spectrum Absorption spectrum Emission spectrum Doppler Effect </li> <li> Slide 3 </li> <li> Electromagnetic Radiation All different types of wavelengths of energy o Gamma rays to radio waves o Organized in the electromagnetic spectrum o All energy travels at the same speed through a vacuum = 300,000 km per sec </li> <li> Slide 4 </li> <li> Electromagnetic Radiation Light can behave like a wave or a particle o It has a wavelength and a wave height o Can be separated into separate colors and wavelengths by a prism </li> <li> Slide 5 </li> <li> Electromagnetic Radiation In some cases, light acts like a stream of particles called photons o Small bullets from a machine gun o They push matter The force they exert is called radiation pressure Photons from the sue cause the tail of the comet o Shorter wavelengths have more energetic photons and longer wavelengths have less energy </li> <li> Slide 6 </li> <li> Spectroscopy Study of the properties of light that depend on wavelength o Sir Isaac Newton used a prism to separate light into its component colors o ROY G BIV Continuous Spectrum o Made by an incandescent solid, liquid or gas under pressure o Uninterrupted band of color o Comes from an incandescent </li> <li> Slide 7 </li> <li> Spectroscopy Absorption Spectrum o Visible light passes through a cool gas under low pressure o Gas absorbs some wavelengths o Continuous spectrum with dark lines running through it </li> <li> Slide 8 </li> <li> Spectroscopy Emission Spectrum o Produced by hot gases under low pressure o Bright lines of particular wavelengths Important o Each element or compound has a unique set of spectra lines o These lines act as fingerprints o They show which elements or compounds are present in a star </li> <li> Slide 9 </li> <li> Emission Spectrum </li> <li> Slide 10 </li> <li> Spectroscopy Suns spectrum o Has thousands of dark lines o More than 60 elements have been identified in the sun </li> <li> Slide 11 </li> <li> Slide 12 </li> <li> Doppler Effect The perceived change in wavelength of a wave that is emitted by source that is moving away or toward an object. o Moving toward an object causes the wavelengths to push together and become shorter Blue Shift o Moving away from an object causes the wavelengths to spread apart and become longer Red Shift o Used to determine if a star or bright object is moving away or towards the observer Amount of shift depends on the rate at which it occurs o Larger the shift; the faster the speed o Smaller the shift; the slower the speed Compare the absorption spectrum to the standard spectrum produced in a lab </li> <li> Slide 13 </li> <li> Doppler Shift </li> </ul>