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Questions and Answers
What primarily determines the color appearance of cooler stars?
What primarily determines the color appearance of cooler stars?
What do Fraunhofer lines in a star's spectrum indicate?
What do Fraunhofer lines in a star's spectrum indicate?
What is the primary function of a spectrometer?
What is the primary function of a spectrometer?
What does the spectral class of a star indicate?
What does the spectral class of a star indicate?
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Based on spectral analysis, what is the predominant composition of stars?
Based on spectral analysis, what is the predominant composition of stars?
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Study Notes
Cooler Stars
- Cooler stars radiate more energy in the infrared and visible light spectrum.
- Appear red to the human eye.
Hot Stars
- Hotter stars radiate more energy in the violet and ultraviolet spectrum.
- Appear blue to the human eye.
Spectrometer
- An instrument used to measure starlight.
- Splits light into a spectrum to reveal its colours.
Distinctive Lines
- Distinctive lines within a star's spectrum can reveal its chemical composition.
- Dark lines in a spectrum indicate missing colours.
- These"Fraunhofer lines" form when light interacts with atoms in a star's outer layers.
- Light energy is absorbed by electrons in atoms in the outer layers of the star.
- This absorption occurs at specific wavelengths, corresponding to the same wavelengths an element would emit when extremely hot.
Spectral Class
- A classification system used to classify stars based on their spectra.
- It indicates the elements, temperature, and colour of a star.
Nuclear Fusion
- Nuclear fusion in stars generates heavy elements such as hydrogen, helium, oxygen and others.
- The gravitational forces within a star cause nuclear fusion.
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Description
Explore the fascinating world of stars with this quiz on cooler and hot stars, their spectral classifications, and the use of spectrometers in analyzing starlight. Test your knowledge on how the energy from stars reveals their chemical composition and appearance. Discover the significance of Fraunhofer lines and what they tell us about different types of stars.
