ae100hw6 - Rochelle Colvin A E100 October 01, 2009 A toms...

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Rochelle Colvin AE100 October 01, 2009 Atoms and Starlight Chapter 6 Problems 2. If a star has a surface temperature of 20,000k, at what wavelength will it radiate most energy? Using the Wien’s Displacement law to find out what wavelength will radiate most energy: 3 * 10 6 ÷ 20,000K = 150nm The wavelength that will radiate most energy is 150nm. 3. Infrared observations of a star show that it is most intense at a wavelength of 2000nm. What is the temperature of the star’s surface? Using the Wien’s Displacement law to find out what is the temperature of the stars surface: 3 * 10 6 ÷ 2000nm = 1,500K The temperature of the stars surface is 1,500K. 5. If one star has a temperature of 6000k and another star has a temperature of 7000k, how much more energy per second will the hotter star radiate from each square meter of its surface? Using the Stefan-Boltzmann law to find out how much more energy the hot star radiates: [(E hot ) ÷ (E cool )] = [(T hot 4 ) ÷ (Tcool 4 )] = [(7000 4 ) ÷ (6000 4 )] = 1.85
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The hotter star will emit 1.85 energy per second more than the energy of the cool star.
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This note was uploaded on 11/03/2009 for the course AE 100 taught by Professor Sanyal during the Spring '09 term at Capitol College.

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ae100hw6 - Rochelle Colvin A E100 October 01, 2009 A toms...

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