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ES: Ch. 30 Quiz Vocabulary Notes
1.
2.
3.
4.
5.
Spectrum
Color wavelength
Continuous spectrum
Emission spectrum
Dark‐line Absorption spectrum
6. Element
7. Red‐shift
8. Blue‐shift
9. Doppler effect
10.Big Bang Theory
Spectrum
• A display of colors emitted from and/or absorbed by space objects like stars.
• There are three types of spectra: Continuous, emission, and dark‐line.
• Could also be referred to as the electromagnetic spectrum (of all forms of energy).
Color Wavelength
Continuous Spectrum
• A specific wavelength of light we see as a specific color. When all colors wavelengths combine we see light as white.
• Red is the longest, yellow is in the middle, blue and violet are the shortest.
• There are many shades of each color.
• All colors are present in the spectrum of light.
Emission Spectrum
Dark‐line Absorption Spectrum
• The specific color wavelengths given off (emitted) from the gaseous chemical element reactions of space objects. Colored lines on a spectrum.
– Same colors that the chemical elements will absorb when the light comes from another source.
• The dark lines indicate the light colors that are absorbed by the gaseous chemicals of space object. All shown colors pass through to our eyes.
• The same light colors will be emitted if those energy reactions begin to happen.
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http://www.oglethorpe.edu/faculty/~m_rulison/Astronomy/Chap%2004/chapter_4_lecture_notes.htm
http://nptel.iitm.ac.in/courses/Webcourse‐contents/IIT‐KANPUR/ModernSurveyingTech/lectureD_19/D_19_3.htm
Element
• A substance made of one type of material.
– One type of atom combined to form many of the same atoms together.
– Ex. Carbon by itself
– Ex. Hydrogen by itself
Red‐shift
• When a certain color wavelength is “stretched,” to a color closer to the red end of the color spectrum.
• Caused by a certain color wavelength moving away from an observer.
Blue‐shift
• When a certain color wavelength is “squeezed,” to a color closer to the blue end of the color spectrum.
• Caused by a certain color wavelength moving toward from an observer.
Doppler Effect
• The shift (change) in the wavelength of light from an object as the object moves towards or away from the observer.
http://jdem.lbl.gov/DarkEnergy.html
• Also an effect on sound waves. 2
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Doppler Effect
• Also an effect on sound waves. Big Bang Theory
1. 14 billion years ago, all matter in one small volume
– Based on red‐shift of color of most space objects
2. A “sudden event” caused all matter to be sent outward in all directions
– Theories of first possible reactions between elements
3. Gravitational attraction between all matter began to cause the formation space objects (stars, galaxies, planets).
http://people.finearts.uvic.ca/~aschloss/course_mat/MU207/wolfenden_article.html
http://science.howstuffworks.com/dictionary/astronomy‐terms/big‐crunch.htm/printable
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