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Survey of Astronomy

by: Toni Adams

Survey of Astronomy ASTRON 103

Toni Adams
GPA 3.96


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Class Notes
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This 2 page Class Notes was uploaded by Toni Adams on Tuesday October 27, 2015. The Class Notes belongs to ASTRON 103 at University of Wisconsin - Milwaukee taught by Staff in Fall. Since its upload, it has received 20 views. For similar materials see /class/230283/astron-103-university-of-wisconsin-milwaukee in Astronomy at University of Wisconsin - Milwaukee.


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Date Created: 10/27/15
Astronomy 103 online Sample Problems for Week 4 Spring 2010 The wavelengths of light emitted by atoms are short typically of order 10 6 m and they are commonly expressed in nanometers nm where lnm 10 9m one billionth of a meter The wavelengths of visible light range from 400 nm blue end really violet to 700 nm red The ultraviolet range is from about 1nm to 400 nm The formula given in C M and the notes that relates the peak wavelength emitted by a hot object to the temperature of the object was expressed in cm 29cm A T 7 with T in degrees Kelvin Using 1m 109nm we have 1cm 10 2m 107nm Then 29cm 29 gtlt106nm and the equation can also be written in nanometers in the form A 29 gtlt106 nm39 T We can solve the equation for T Multiply both sides by T then divide both sides by A i 29 gtlt106 nm T A 1 Rigel has surface temperature 20000 K What is the peak wavelength of the light it emits What kind of light is this using the names for the parts of the spectrum from gamma rays to radio waves 2 The peak wavelength of light emitted by the star Betelgeuse is 800 nm What is the tem perature of Betelgeuse7s surface What kind of light is this Astronomy 103 1 E0 Solutions to Sample Problems Spring 2004 Rigel has surface temperature 20 000 K What is the peak wavelength 0f the light it emits What hind 0f light is this 6 29 1 A A 14 gtlt 102nm 2 gtlt 104 At 140 nm this is ultraviolet light shorter than the shortest 400 nm Visible light We see Rigel as a blue star The peak wavelength 0f light emitted by the star Betelgeuse is 800 nm What is the temper ature 0f Betelgeuse s surface What hind 0f light is this 29 gtlt 106 3 T 7 W 7 36 gtlt 10 K The peak wavelength of 800 nm is a little longer than the red end of the Visible spectrum in the infrared and we see Betelgeuse as a red star


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