v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The...

Problem 1) The graph below shows an approximation to the spectrum of electromagnetic radiation from the star Betelgeuse (brightest star in the constellation Orion). This star is known to be a distance of 643 light years from the Earth (1 light year is the distance light travels in a year). The intensity of electromagnetic radiation (power per area) from Betelgeuse as measured on Earth is 8 × 10 -11 times the intensity of electromagnetic radiation from the sun (the solar constant). Using this information, estimate the radius of Betelgeuse. How many times larger is this than the Sun’s radius? How does this compare to the distance between the Sun and the earth? Hint: For part b), don’t forget that some of the absorbed power goes to electrical power!

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Transcript of v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The...

Page 1: v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The incident intensity of the sun at the distance of the earth is 1367 a) How much power

Problem 1) The graph below shows an approximation to the spectrum of electromagnetic radiation from the star Betelgeuse (brightest star in the constellation Orion). This star is known to be a distance of 643 light years from the Earth (1 light year is the distance light travels in a year). The intensity of electromagnetic radiation (power per area) from Betelgeuse as measured on Earth is 8 × 10-11 times the intensity of electromagnetic radiation from the sun (the solar constant). Using this information, estimate the radius of Betelgeuse. How many times larger is this than the Sun’s radius? How does this compare to

the distance between the Sun and the earth?

Hint: For part b), don’t forget that some of the absorbed power goes to electrical power!

Page 2: v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The incident intensity of the sun at the distance of the earth is 1367 a) How much power

Page 3: v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The incident intensity of the sun at the distance of the earth is 1367 a) How much power

Page 4: v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The incident intensity of the sun at the distance of the earth is 1367 a) How much power

Page 5: v W & } U } v [ ( } P Z } u } ( Z } } Á P } } o ] omav/Phys157/HW4_2019sol.pdf · power. The incident intensity of the sun at the distance of the earth is 1367 a) How much power

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