Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Visible Light Spectra Using a Spectroscope Spectrum (Prisms) – when light is passed through a prism • The light is bent into the visible spectrum Spectrum • Visible Light – Made of various colors, each with a different wavelength. – These are the colors seen in a rainbow, Spectrum • Visible Light – Made of various colors, each with a different wavelength. • (Red, Orange, Yellow, Green, Blue, Violet) – These are the colors seen in a rainbow, Spectroscope •Uses a prism to split the light gathered by a telescope into a spectrum. (roygbv) Parts of a Spectroscope • Lens • Prism • Spectrum Three types of Spectra • Three different types • Continuous Spectrum • Emission Spectrum also called a bright line spectrum • Absorption Spectrum also called a dark line spectrum • Allow astronomers to figure out what elements make up the atmospheres of stars and planets. Continuous Spectrum • Unbroken band of colors • Shows that the source is emitting all visible wavelengths. Emission Spectrum • A series of unevenly spaced lines of different colors and brightness. • Called a bright line spectrum. • The bright lines show that the source is emitting light of certain wavelengths. Emission Spectrum • Produced by glowing gases. • Every element has a unique emission spectrum – Allows scientists to determine the elements in objects. Absorption Spectrum • A continuous spectrum crossed by dark lines. • Called a dark line spectrum. • Lines form when light from a glowing object passes through a cooler gas. – The gas absorbs the wavelengths. Absorption Spectrum • The colors absorbed are the same that the gas would emit. – Absorption Spectrum for Hydrogen – Emission Spectrum for Hydrogen Chemical Composition • Chemical elements in a star’s atmosphere absorb light from the star. • Each element absorbs a different wavelength. Each absorbed wavelength is shown as a dark line on a spectrum. Chemical Composition • It acts like a finger print each element has a unique set of lines. • By comparing the star’s spectrum to the known spectrums of different elements, astronomers can determine the elements present. Temperatures • Most stars have a chemical composition similar to the sun. 73% H, 25%He and 2% other elements. • Stars at different temps produce different line spectrums. • If the star is at about 10,000˚C it produces a very strong spectral lines for H. • If the hydrogen line is not strong, it means the star is cooler than 10,000˚C Absorption Spectrums Absorption Spectrums Absorption Spectrums