Chap3 - Light_Telescopes

Chap3 - Light_Telescopes - Neil F Comins William J Kaufmann...

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Discovering the Universe Discovering the Universe Ninth Edition Ninth Edition Neil F. Comins • William J. Kaufmann III CHAPTER 3 CHAPTER 3 Light and Telescopes Light and Telescopes
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In this chapter you will discover… In this chapter you will discover… Light is a part of electromagnetic spectra, & how Light is a part of electromagnetic spectra, & how astronomers use the entire spectrum of electromagnetic astronomers use the entire spectrum of electromagnetic radiation to observe the astronomical objects. radiation to observe the astronomical objects. How telescopes collect and focus light. How telescopes collect and focus light. The limitations of telescopes. The limitations of telescopes. What the ground-based and space-based high- What the ground-based and space-based high- technology telescopes being developed can do. technology telescopes being developed can do.
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When a beam of white light passes through a glass prism, the light is separated or refracted into a rainbow-colored band called a spectrum. The numbers on the right side of the spectrum indicate wavelengths in nanometers (1 nm = 10 -9 m).
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Electromagnetic radiation travels as waves. Thomas Young’s interference experiment shows that light of a single color passing through a barrier with two slits behaves as waves that create alternating light and dark patterns on a screen. (See next slide).
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In 1860, James Clerk Maxwell unified the theories of electricity and magnetism. The electric and magnetic fields travel through space together in the form of electromagnetic waves. These waves are characterized by their wavelength , the distance between two peaks in a wave.
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Wave Motion Wave Motion
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Relation between Relation between frequency: f frequency: f wavelength: wavelength: λ λ wave speed: v wave speed: v source speed: vs source speed: vs The wave pattern moves the distance The wave pattern moves the distance v in one second. v in one second. Number of wave crests you see in a Number of wave crests you see in a second at a fixed point is “frequency”. second at a fixed point is “frequency”. Note: One crest per wavelength. Note: One crest per wavelength. The number of wavelength in it is The number of wavelength in it is f=v/ f=v/ λ λ
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What is the frequency of the wave with What is the frequency of the wave with v=20m/s and v=20m/s and λ λ =5m?
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Chap3 - Light_Telescopes - Neil F Comins William J Kaufmann...

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