PHYS 183 Lecture Notes - Lecture 13: Blueshift, The Sharper Image, Angular Distance
Document Summary
Phys 183 the milky way inside and out tracy webb. Lecture 13: february 4th, 2013 the doppler effect measuring velocity this is how we know the earth is expanding this is also how police know that you are speeding uses light waves. We hear different sounds because they have different frequencies. We measure the shift through the location of spectral lines can tell how faster it is moving by the amount of shift. Only measures the velocities along the line of sight tells us the motion of an object toward or away from us, not perpendicular *important point if it"s not moving directly away from you, you get less squishing. Chapter 6 important properties of telescopes light collecting area telescopes with a larger collecting area can gather a greater amount of light in a shorter time (can see fainter ie/ farther away. Depends on the area of the dish which depends on its radius squared.
