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Lecture 8

Astronomy Lecture 8

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Department
Astronomy
Course
ASTR 100
Professor
Govindrajan
Semester
Fall

Description
Astronomy Lecture 8 9/13/13 Nature of Light 1. Electromagnetic Radiation a. Electromagnetic waves are transverse i. Like a sin curve 1. Run perpendicular to the direction of motion ii. Act like particles and waves 1. Thomas Young 1801 demonstrated the wave like  properties 2. Einstein 1905 demonstrated the particle like properties b. Speed is the same for all kinds of electromagnetic radiation i. Speed of light=wavelength*Frequency ii. Normal speed of light= 2.995*10^8 m/s) c. E=h*v (energy is proportional to frequency i. (h=Planck’s constant= 6.67*10^­34 Joule sec) d. C= Lambda * v i. V= frequency (how often peaks happen) 2. Light Distances a. .8 seconds earth to moon b. 8.3 minutes earth to sun c. 4.1 years 
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