Read Chapter 5 : “Light” Homework: MasteringAstronomy Assignment Chapter 5 Midterm: Next Tuesday, Sept. 30 (in 1 week). - Covers Chapters 1-5 - 30 Multiple Choice Questions (We provide scantron forms.) No calculators needed. - Questions are based on: - Book - Lectures - Homework
Observing Project #1: Observing Project #1: Monitoring the Motion of Mars Monitoring the Motion of Mars Chart the position of Mars in the night sky relative to Saturn and the star, Antares. Observe Mars, Saturn, and Antares in the evening sky three times (once per week), between Sept 9 and October 1. Write one to two paragraphs explaining your observations of the position of Mars. Did it move? If so, why did it move the way it did? Due Thursday, October 2. Sept. 5, 2014
Look just to the left of San Francisco... Where is Mars?
Properties of Light Light can act as a wave: “Electromagnetic wave” Light can act as a particle: “photon” Light has wavelength and frequency. Light travels at the speed of … c = 300,000 km/s c = 300,000 km/s Light
Summary of Demos: E+50+20 Prism - to be used with overhead projector E + 15 + 25 Discharge tubes: view with diffraction gratings, Neon and hydrogen. Can tell composition from pattern of lines. include: 100 slide-mounted diffraction gratings & 50 stick-mounted gratings, all in the physics stockroom under E + 15 + 25 Comes with E+50_20: Carbon or Tungsten lamp with variac: change temp. and view with the diffraction gratings to see blue emerge. Blackbody radiation: hot --> blue F+15+20 Solar-cell-powered helicopter Doppler: spin buzzer overhead. More gratings are in 264 Evans (TALC room).