Astronomy 101: week 2, lecture 2
Astronomy 101: week 2, lecture 2 ASTR 101
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This 2 page Class Notes was uploaded by Breanab on Wednesday January 13, 2016. The Class Notes belongs to ASTR 101 at University of New Mexico taught by Trace Tessier in Spring 2016. Since its upload, it has received 15 views. For similar materials see Introduction to Astronomy in Astronomy at University of New Mexico.
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Date Created: 01/13/16
Chapter 2: EM Waves Review • The force of gravity between two objects decreases rapidly with the separation distance, and increases with mass. • The acceleration experienced by a falling object due to earths gravity is independent of the mas of the object. • A mars-sized and a Jupiter-sized planet both orbit a star at the same distance. The mars-sized planet has the same orbital period when compared to that of the Jupiter-sized planet. • W=mg • acceleration=(gravitational mass * G)/ inertial mass • acceleration=F/m What is a wave? • Waves are a type of disturbance that can propagate or travel • Waves carry information and energy • A disturbance to a medium that travels in a function • Has a temporal quality • Vocabulary: oscillating , pulse What are the main properties of waves? • Period (T): time between crest (or trough) passages • Frequency (f): rate of passage of crests ( or troughs), f=1/T unit: Hertz or cycles/sec o Crest, trough. Wavelength (lambda), amplitude (A), velocity=wavelength * frequency • Different waves travel different distances at different speeds What two things do all waves transport? • Waves carry information and energy, light Light travels at a constant speed, c, the speed of light Electric Force • Opposites attract, like repels • Oscillating charges radiate • All objects have temperatures greater than absolute zero – random thermal motion • All objects radiate • No sound if there is no air - vacuum • Radiation cannot be seen from many ordinary objects because there is not enough heat, its in a different wavelength and frequency What are some examples of electromagnetic radiation and what are the different ways in which we might experience them or make use of them? • The color of visible light • Electromagnetic radiation o Visible - see, infrared - heat, radio – communication, UV – sunburn, X-rays – medical, gamma – highest Review • The bending of light that occurs when moving between media of different densities is called refraction • If the wavelength of light increases, the frequency must decrease • The color of visible light is determined by its wavelength and frequency
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