Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 34, Problem 2FTD
To determine
To compare the temperature of the stars.
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You are looking at 2 heated metal pieces. One looks red and the other looks green. Which one is hotter? Explain.
Question A7
The intensity of the emitted radiation by a star is at a maximum at a wavelength of 78.9 nm.
a) Calculate the surface temperature of the star.
b) Calculate the ratio of the intensity radiated at 65.0 nm to the maximum intensity.
Assume that the star radiates like an ideal blackbody.
The thermal (black-body) radiation from a star peaks at a wavelength of 300 nm.
What is the surface temperature of the star in K?
Chapter 34 Solutions
Essential University Physics (3rd Edition)
Ch. 34.2 - Prob. 34.1GICh. 34.3 - If you replot Fig. 34.7 for a material with a...Ch. 34.3 - Prob. 34.3GICh. 34.4 - Prob. 34.4GICh. 34.5 - Prob. 34.5GICh. 34.6 - Prob. 34.6GICh. 34 - Prob. 1FTDCh. 34 - Prob. 2FTDCh. 34 - Prob. 3FTDCh. 34 - Prob. 4FTD
Ch. 34 - Prob. 5FTDCh. 34 - Prob. 6FTDCh. 34 - Prob. 7FTDCh. 34 - Prob. 8FTDCh. 34 - Prob. 9FTDCh. 34 - Prob. 10FTDCh. 34 - Prob. 11FTDCh. 34 - Prob. 12FTDCh. 34 - Prob. 13FTDCh. 34 - Prob. 14FTDCh. 34 - Prob. 15ECh. 34 - The surface temperature of the star Rigel is 104K....Ch. 34 - Prob. 17ECh. 34 - Prob. 18ECh. 34 - Prob. 19ECh. 34 - Prob. 20ECh. 34 - Prob. 21ECh. 34 - Prob. 22ECh. 34 - Prob. 23ECh. 34 - Prob. 24ECh. 34 - Prob. 25ECh. 34 - Prob. 26ECh. 34 - Prob. 27ECh. 34 - Prob. 28ECh. 34 - Prob. 29ECh. 34 - Prob. 30ECh. 34 - Prob. 31ECh. 34 - Prob. 32ECh. 34 - Prob. 33ECh. 34 - Prob. 34ECh. 34 - Prob. 35ECh. 34 - Prob. 36ECh. 34 - Prob. 37ECh. 34 - Prob. 38PCh. 34 - Prob. 39PCh. 34 - Prob. 40PCh. 34 - Prob. 41PCh. 34 - Prob. 42PCh. 34 - Prob. 43PCh. 34 - Prob. 44PCh. 34 - Prob. 45PCh. 34 - Prob. 46PCh. 34 - Prob. 47PCh. 34 - Prob. 48PCh. 34 - Prob. 49PCh. 34 - Prob. 50PCh. 34 - Prob. 51PCh. 34 - Prob. 52PCh. 34 - Prob. 53PCh. 34 - Prob. 54PCh. 34 - Prob. 55PCh. 34 - Prob. 56PCh. 34 - Prob. 57PCh. 34 - Prob. 58PCh. 34 - Prob. 59PCh. 34 - Prob. 60PCh. 34 - Prob. 61PCh. 34 - Prob. 62PCh. 34 - Prob. 63PCh. 34 - Prob. 64PCh. 34 - Prob. 65PCh. 34 - Prob. 66PCh. 34 - Prob. 67PCh. 34 - Prob. 68PCh. 34 - Prob. 69PCh. 34 - Prob. 70PCh. 34 - Prob. 71PCh. 34 - Prob. 72PCh. 34 - Prob. 73PCh. 34 - Prob. 74PCh. 34 - Prob. 75PCh. 34 - Prob. 76PCh. 34 - Prob. 77PCh. 34 - Prob. 78PCh. 34 - Prob. 79PCh. 34 - Prob. 80PCh. 34 - Prob. 81PCh. 34 - Prob. 82PCh. 34 - Prob. 83PCh. 34 - Prob. 84PPCh. 34 - Prob. 85PPCh. 34 - Prob. 86PPCh. 34 - Prob. 87PP
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- Check Your Understanding Suppose that two stars, and . radiate exactly the same total power. If the radius of star is three times that of star , what is the ratio of the surface temperatures of these stars? Which one is hotter?arrow_forwardWhy can you see through glass but not through wood?arrow_forwardIf everything radiates electromagnetic energy, why can we not see objects at room temperature in a dark room?arrow_forward
- The blackbody radiation emitted from a furnace peaks at a wavelength of 2.5 10-6 m (0.0000025 m). What is the temperature inside the furnace? answer ... Karrow_forwardWhat can be said about the relative temperatures of whitish-yellow, reddish, and bluish stars? Explain.arrow_forwardThe human eye is most sensitive to 560-nm (green) light. What is the temperature of a blackbody that would radiate most intensely at this wavelength?arrow_forward
- The radius of our Sun is 6.96 x 108 m, and its total power output is 3.85 x 1026 W. Assuming the Sun's surface emits as a black body, calculate its surface temperature.arrow_forwardConsider the following. (a) Model the tungsten filament of a lightbulb as a blackbody at temperature 3320 K. Determine the wavelength of light it emits most strongly. Your response differs from the correct answer by more than 10%. Double check your calculations. nmarrow_forwardA cavity radiator has its maximum spectral radiance at a wavelength of 6,9×10 m. If the body is heated so that T/To = 9,4, what will be the ratio of radiant powers W/Wo? Wien's constant b = 2.897 x103 m-K. 3aarrow_forward
- An incandescent lightbulb contains a tung-sten filament that reaches a temperature of about 3020 K, roughly half the surface temperature of the Sun. (a) Treating the filament as a blackbody, determine the frequency for which its radiation is a maximum. (b) Do you expect the lightbulb to radiate more energy in the visible or in the infrared part of the spectrum? Explain.arrow_forwardThe human eye is most sensitive to 560-nm (green) light. What is the temperature of a black body that would radiate most intensely at this wavelength? Karrow_forwardA red laser with wavelength 633 nm emits 1.92kW of power. The number of photons emitted per second is: Round your answer to 3 significant figures. Add your answerarrow_forward
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