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Question: a the value of a stars apparent magnitude so that...

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a the value of a stars Apparent Magnitude, so that a star having an Apparesnt m-22 star You will be wsing te folowing Geogeora appleto esplone the relaticeship between flex and apparent maenitude Apparent Magnitude Versus Light Flux at Earth luz -709x 10 Watts Apparent Magnitude -1.0 Leg of Light Flux If you are having trouble using this embeáded applet, go to Altcmate.ways.sf Asssosing Sar fi would bare D of 25 10-9 wats per sqare denre, the appliet showrs you that such a star has an Absonune Magtatude of about 2 than a magtitude 2.5 tar Laminosity is related to fusx by the inverse square law. The flux at a distance R equals the bumanosity Aisided by the area of a sphencal shell of radus r, whuch an
calculate the total power per unit surface area (recall this is proportional to T), so you can infer the surface area of the star by dividing the luminosity (total y by the total power per unit surface area Then assume the star is spherical, it is a simple matter to calculate the radius once you know the surface area n the bookmarks bar. Import bookmarks now. The amimated GeoGebra Applet below allows you to esplore the 3- way relationship between Suface Temperature and Absolute Magnitude Move the yellow dot anywhere on the graph and read off the valoes of the Properties Absolute Magnitude versus Temperature for various Radi r 01 Absolute Magnitude -3.29 Surface Temperature= 4850 K Radius 2.86 Solar radi 、、 Negate, Log Temperature HOTCOLD 丶丶 丶 Notice how this graph is oriented . High Temperture to the lefh Lower Temperatures to tbe right The graph is presented in this way to get students used to the conventional way that Hezsgrang-Russel dagrams are presented You should be able to set the star to have the values of the Sun: radius 1 Solar Radius and the Temperature 5800 K The graph tells you that the Absolute Magnitude of the Sun is 48 How big would a star seed to be if it had the same Temperature as the Sun but was much more loni Set the stat to Have M-1 and Temperature-5900 K (move it directly up until M 1) The graph tells you thas the radius is about 6 Solar Radi (6 times bigger than the Sun )
Question 1 (1 point) The three questions for this quiz are testing your ability to read the graphs of steller properties which are provided in the course contents. Which of the following is closest to the Absolute Magnitude of a star having a luminosity of 1200 times the luminosity of the Sun? -2.5 -3 -3.5 -2 Question 2 (1 point) Which of the following is closest to the surface temperature of a star the same size as the Sun but having an Absolute magnitude of -1? 7000 K 12000 K 22000 K 60000 K
Question 3 (1 point) Which of the following is closest to the spectral class of the star in the previous question? 06 AO A9 B2 B8
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