YOUR LEGIBLE NAME________________________________________

Astro 203, Section 1, Olszewski and Bailin, Feb 8, 2002
Answer completely and concisely. Closed book, closed notes.
You may use a calculator. If you make a drawing, EXPLAIN IT.

1) When we say that Keck is a "ten-meter telescope," to what are we referring?
Why does that matter?






2) a) Draw a picture that explains the idea of parallax. 
      Show the two positions of the observer and the position of the nearby
      object and the placement of the faraway objects.

   b) How/WHY does parallax depend on the distance to the object in question?
   c) How/WHY does parallax depend on the baseline between the two observation 
     points?











3) If the lab wavelength of H-alpha light is 6563 Angstroms, and
    if you measure the wavelength of H-alpha in a star to be 6561 Angstroms...
   Given that the speed of light is 300,000 km/s, how fast is
    this star moving? Is this star moving towrds us or away? How do you know?












4) Sketch AND EXPLAIN a picture to explain how you get 
    absorption lines (one of Kirchoff's laws).