Astronomy Notes - Astronomy Notes REMINDER Midterm is in...

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Astronomy Notes September 20, 2007 REMINDER: Midterm is in room THH 201 ALMOST ALL ASTRONOMICAL INFORMATION COMES BY SOME FORM OF LIGHT. Light Waves: - language and description - build intuition - properties What is light? Some form of energy transfer Is it via…. a) particles? (e.g. a thrown object) b) waves? (e.g. sound waves) What is a wave? A wave is a form of energy transfer with no net motions of matter. E.g. wave machine, earthquake=waves (San Andreas to LA, energy transferred) Description of waves: 1.) measure between peaks and between troughs or crests (peaks) to get wavelength ( λ ) 2.) speed of propagation, velocity. Measure m/s, km/s 3.) frequency stay at a fixed point in space and ask how many times do you go up and down in a second? Frequency = number of complete up and down motions in a second (number of crests going by in a second) - Usually measured in cycles/second, or Hz (Hertz). 1 Hz=1 cycle/second 4.) Period, T (T=time for one complete up and down motion (in seconds) RELATIONSHIPS: - F=1/T, e.g. period=.05 seconds, frequency=1/.05 seconds=20 Hz
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