ASTRON 100 Lecture Notes - Lecture 10: Black-Body Radiation, Electromagnetic Spectrum, Ultraviolet
7 Sep 2016
School
Department
Course
Professor
Document Summary
Survey question: the first quarter moon is high in the southern sky. Properties of waves: wavelength the distance between crests (or troughs) of a wave, frequency the number of crests (or troughs) that pass by each second. Speed the rate at which a crest (or trough) moves. For all waves: wavelength x frequency = speed. 12. c = speed of light, 300,000 km/s. 13. the energy of a photon is given by e = hv. Survey questions: red light has a much longer wavelength than blue light. Red light must therefore: have a lower frequency than blue light. Properties of lights: all light travels at the same speed of light . In our brain, a combination of red blue and yellow photons. Visible light is a small part of the entire electromagnetic spectrum. Shorter wavelength, higher frequency, higher energy to longer wavelength, lower frequency, lower energy: gamma rays, x-rays, ultraviolet radiation, infrared radiation, microwave radiation, radio waves.
