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Choose a category. You will be given the answer. You must give the correct question. Click to begin. Click here for Final Jeopardy Spectra Stars Time Vocabulary Miscellaneous 10 Point 10 Point 10 Point 10 Point 10 Point 20 Points 20 Points 20 Points 20 Points 20 Points 30 Points 30 Points 30 Points 30 Points 30 Points 40 Points 40 Points 40 Points 40 Points 40 Points 50 Points 50 Points 50 Points 50 Points 50 Points By measuring the red-shifts of the most distant galaxies, it is possible to calculate the a. b. c. d. Doppler shifts apparent magnitudes absolute magnitudes expansion rate of long ago Expansion rate of long ago The diagram above shows a standard spectrum compared to that of a distant star. From this figure, what can you conclude about this stars motion relative to Earth? The star is moving away from earth (red shift) A solid, opaque object can be heated to different temperatures. What happens to the luminosity and wavelength of the light emitted by this object as the temperature increases? Brighter and shorter wavelength What type of spectra does an incandescent light have compared to Helium gas? Incandescent – continuous spectrum Helium gas- emission line spectrum How far does a radio wave travel in 6 minutes? (speed of light 3 x 108 m/s). D=sxt (3 x 8 10 )(3.6x 10.8 x 1.08 x 2 10 ) 10 10 11 10 m Why is star C brighter than star D? C is hotter Why is star B brighter than Star A? Star B (main sequence) is larger The fusion of hydrogen to helium occurs in what type of stars? Main sequence stars like the sun As time goes on, what will happen to the ratio of Hydrogen to Helium in this star? Helium increase as hydrogen decrease The sun is in equilibrium meaning it neither shrinks nor grows, this is due to a balance between what two features? Gravity and gas pressure •An astronomer uses a telescope to observe a star. The color of the star indicates that it has a size and surface temperature similar to that of the Sun. Using this information, the astronomer can conclude that the star 1.is older than the Sun. 2.will survive for several billion years. 3.is moving very quickly away from Earth. 4.has a mass similar to the mass of Jupiter. Will survive several billion years How long will a star with the same mass as the sun stay on the main sequence? 10 billion years According to Big bang, age of universe is calculated to be about how old? 13-14 billion years As mass increases, what happens to the life span of a star? As mass increases, stars do not live as long About how long would a star with a mass 1.5 times that of the sun live? 5 billion years Theory that states universe began as pure energy Big Bang FREE FREE The group our milky way galaxy belongs to Local Group Used to measure the distance of stars within 1,000 light years of earth Parallex You look at two stars in the night sky and notice one appears brighter. What property or characteristic of the star is this? Apparent magnitude Evidence suggests the universe contains a great amount of ___________matter Dark matter How long after Big Bang did it take universe to cool to 9o 10 C? 3 minutes Heaviest element formed in core of a star? iron According to recent observations, what is occurring to the rate of expansion of universe? Rate of expansion is speeding up If the mass of our sun were reduced by one half of its current mass, approximately how much longer would it live compared to its current mass? 5 billion years (15b-10b) Make your wager 1. What occurs in a main sequence star? 2. What does a main sequence star the size of our sun change to after this process ends? 1. Hydrogen fuses to Helium 2. Red giant