Chapter 24 and 25 Review – Flashcards
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Gamma rays, X-rays, Ultraviolet light, visible light, infrared radiation, microwaves, and radio waves
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Be able to name all forms of electromagnetic radiation.
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Red
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Which color has the longest wavelength
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Photons
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Since light exerts pressure on matter, it suggests that it is made of particles of?
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Sir Isaac Newton
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Which famous scientist founded the field of spectroscopy?
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Continuous Spectrum
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Which type of spectrum can be produced by a solid, liquid, or gas?
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Chemical Composition
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What information does a star's spectrum offer about the star?
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Absorption Spectrum
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Which type of spectrum is associated with the radiation of most stars?
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The doppler effect refers to the perceived change in wavelength of a wave that is emitted from a source that is moving away or toward an object.
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What is the doppler effect?
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The wavelength is shorter
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What happens to the wavelength as an object moves towards you?
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High Speeds
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A large Doppler shift indicates?
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If a star or other body is moving away from or toward earth.
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Astronomers use the Doppler Effect to determine a star's?
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Photosphere
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The layer of the sun that radiates most of the light that reaches Earth is?
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Chromosphere
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The outermost layer of the sun is?
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Chromosphere
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Which part of the sun lies directly above the visible "surface" of the sun? Chromosphere
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Granules
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The sun's surface has a grainy texture produced by numerous bright markings called?
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Chromosphere
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The thin red rim seen around the sun during a total solar eclipse is called ?
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Hydrogen
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The sun's surface is made up mostly of this gas.
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Solar Wind
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Streams of electrons and protons that shoot out from the sun's corona make up the solar?
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Solar Flares
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What are the most explosive events that occur on the sun?
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Because they are cooler
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Why do sunspots appear dark?
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Solar flares produce high energy particles and radiation that are dangerous to living organisms.
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What effect do solar flares have on Earth?
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Sun produces energy
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The product of nuclear fusion is this.
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Nuclear Fusion
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The source of the sun's energy is?
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5.5 billion years
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The sun can continue to exist in its present stable state for how many billion of years?
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red
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Which color of stars have the highest surface temperature?
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Yellow
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A star with a surface temp between 5000k and 6000k appears what color?
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Purple
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Stars of which color have the coolest surface temperature?
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300,000 km
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A light year is approximately how many kilometers?
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Light-years
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Stellar distances are usually expressed in what units? Light-years
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is the apparent brightness of a star if it were viewed from a distance of 32.6 light years; used to compare the true brightness of stars
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What is absolute magnitude?
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the brightness of a star when viewed from earth
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What is apparent magnitude?
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Main Sequence stars
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90% of the stars in the HR diagram are this type of star.
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Red
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Which main sequence stars are the most massive?
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Blue
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Which main sequence stars are the least massive?
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Nebula
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What is another name for interstellar matter that will eventually form a star?
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Supernova
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Massive stars that terminate in a brilliant explosion are called this.
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Neutron Star
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Which stars are composed of matter in which electrons have combined with protons?
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run out of fuel and collapse, die
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All stars, regardless of size eventually do this.
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Carbon
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In the cores of extremely hot red giants, nuclear reactions convert helium to this element.
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Red Giant
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When a main-sequence star has exhausted the fuel in its core, it becomes this type of star?
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Main sequence star
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What type of star is our Sun Sol?
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Sun will turn to a Red Giant
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What is the next stage of our sun?
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White Dwarf
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What will the final stage of our sun be?
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black hole
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Light cannot escape the intense gravitational pull of this type of star.
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27,000 light years from the galactic center
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Where is our sun located in the Milky Way Galaxy?
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Globular Cluster
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Which object is the largest? globular cluster, galaxy, star, planet?
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The measure of the red shift
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What indicates that the universe is expanding?
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Faster speeds
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What determines the life cycle of a star?
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a collapsing cloud of gas and dust destined to become a star; a developing star not yet hot enough to engage in nuclear fusion
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What is a protostar?
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In the main sequence stage
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When is a star considered born?
