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any help would be welcome, this is astronomy class .
There are 11 questions and 8 Explore activities for you to answer. Put all of your answers and data in order in a Word document and submit it by clicking on the title of this project assignment "Project. Please note that the Java applet in the Explore 3 section doesn't play well with modern browsers so a better choice would be to type online “blackbody radiation simulation” Use this link to answers the questions below: http://skyserver.sdss.org/dr12/en/proj/advanced/color/colorhome.aspx Explore 1 . Look through SkyServer's database and find several stars whose colors appear different. Find some blue stars, some red stars, some yellow stars, and some white stars. (paste your data below) Explore 2. Now, see if you can discover a pattern in the colors. (after sorting and finding a pattern repaste the resorted data below with your pattern identified). Practice 1 . The star Antares in the constellation Scorpius has a yellow magnitude of 1.2. How much of its light gets to Earth, as compared with Vega? The sun has a yellow magnitude of -26. How much of its light gets to Earth, as compared with Vega? Question 1. If you made a graph of amount of light as a function of wavelength for some of the red stars you saw in Explore 1, what do you think the graph would look like? What about the blue stars? Question 2 . What colors would these two stars appear to your eyes? Question 3 . Some stars have peak wavelengths in the infrared part of the spectrum, longer than red light. Can you still see these stars? Why or why not? What color do they appear? What about stars whose peak wavelengths are in the ultraviolet?
Explore 3. This interactive Java applet will help you learn how thermal radiation curves change with temperature. Click on the link to open a new window, then read the instructions. Try several different temperatures and peak wavelengths. Can you find a mathematical relationship between temperature and peak wavelength? Record your discovery below. Practice 2 . At room temperature, 300 K, what is the peak wavelength of radiation emitted by the hot plate in Angstroms (1 Angstrom = 10 -10 meters)? If the plate glows a dull red ( peak = 6500 Angstroms), what is the plate's temperature? Practice 3 . The Sun has a peak wavelength of thermal radiation peak = 5300 Angstroms. What is the Sun's average temperature? Practice 4 . Find the peak wavelength of the spectrum above - the wavelength where the general trend of the spectrum seems to be at its maximum. From the peak wavelength you found, calculate the average temperature of the star. Explore 4 . Look through the spectra of 10-20 stars in the SDSS data using the Plate Browser tool. Choose a plate, then click on the links for some of the stars on that plate to see their spectra. From the thermal peak of the spectra, calculate the temperature of the stars. Are most of these stars hotter or cooler than the Sun? Question 4. How does the observed spectrum above compare to the thermal radiation curves you saw in the last section? What are the similarities and differences? Question 5. Do you think the star whose spectrum is shown above is a thermal source? Why or why not?
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