Spectrum Notes 1.10.12
Electromagnetic Spectrum
-The electromagnetic spectrum consists of all the different wavelengths of electromagnetic radiation
-Electromagnetic radiation: energy
-light
-radio waves
-x-rays
Wave Length
Astronomers use spectroscopes to view visible light from stars to get information about the stars chemical compositions and temperature
-The electromagnetic spectrum consists of all the different wavelengths of electromagnetic radiation
-Electromagnetic radiation: energy
-light
-radio waves
-x-rays
Wave Length
Astronomers use spectroscopes to view visible light from stars to get information about the stars chemical compositions and temperature
How light shows chemical composition
-Chemical elements in a star’s atmosphere absorb light from the star
-Each element absorbs light at different wavelengths, and each absorbed wavelength appears as a dark line on a spectrum
-Chemical elements in a star’s atmosphere absorb light from the star
-Each element absorbs light at different wavelengths, and each absorbed wavelength appears as a dark line on a spectrum
How Light Shows Temperature
-The amount of energy elements absorb depends on the temperature of the star. Because of this, stars at different temperatures produce different line spectrums
-Dark spectrums high temperature
-Lighter spectrums lower temperature
Radio Waves
-Scientist use radio waves to find distance
-Radio waves are sent out to distant objects, they bounce off the object and come back, how long it takes for the wave to come back is used to calculate distance
-The amount of energy elements absorb depends on the temperature of the star. Because of this, stars at different temperatures produce different line spectrums
-Dark spectrums high temperature
-Lighter spectrums lower temperature
Radio Waves
-Scientist use radio waves to find distance
-Radio waves are sent out to distant objects, they bounce off the object and come back, how long it takes for the wave to come back is used to calculate distance