October 15.docx

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Department
Astronomy & Astrophysics
Course
AST101H1
Professor
Michael Reid
Semester
Fall

Description
October 15, 2013 AST101 – Lecture 11 o light = an electromagnetic wave – electromagnetic radiation  combo of electrical & magnetic fields o photon = particle of light o 300 million km/sec = light’s speed  all light moves at the same speed while in empty space aka vacuum  in material objects, it changes speeds o our eyes perceive wavelengths as different colours o o low frequency = big wavelength, small wavelength = high frequency o blue has the shortest wavelength and highest frequency o electromagnetic spectrum = wavelengths of light  longest = radio waves  shortest = gamma rays o prisms spread out light o spectrums can be graphs or images o blackbody spectrum
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