Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
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Chapter 39, Problem 5P
(a)
To determine
The magnitude of surface temperature of the sun.
(b)
To determine
To find the magnitude of
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The radius of our sun is r = 6.96 × 108 m and its total power is 3.85 × 1026 W. The area of a sphere is A = 4πr2.a) Assuming that the surface of the Sun emits like a black body, calculate its surface temperatureb) Using the result of part (a), find λmax for the sun.
The radius of our Sun is 6.96 x 10° m, and its total power output
is 3.85 x 1020 W. (a) Assuming the Sun's surface emits as a black-
body, calculate its surface temperature. (b) Using the result of
part (a), find Amax for the Sun.
Suppose a star with radius 8.51 108 m has a peak wavelength of 689 nm in the spectrum of its emitted radiation.
(a) Find the energy of a photon with this wavelength. J/photon(b) What is the surface temperature of the star? K(c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1). W(d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star. photons/s
Chapter 39 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 39.1 - Prob. 39.1QQCh. 39.2 - Prob. 39.2QQCh. 39.2 - Prob. 39.3QQCh. 39.2 - Prob. 39.4QQCh. 39.3 - Prob. 39.5QQCh. 39.5 - Prob. 39.6QQCh. 39.6 - Prob. 39.7QQCh. 39 - Prob. 1PCh. 39 - Prob. 2PCh. 39 - Prob. 3P
Ch. 39 - Prob. 4PCh. 39 - Prob. 5PCh. 39 - Prob. 6PCh. 39 - Prob. 8PCh. 39 - Prob. 9PCh. 39 - Prob. 10PCh. 39 - Prob. 11PCh. 39 - Prob. 12PCh. 39 - Prob. 13PCh. 39 - Prob. 15PCh. 39 - Prob. 16PCh. 39 - Prob. 17PCh. 39 - Prob. 18PCh. 39 - Prob. 19PCh. 39 - Prob. 20PCh. 39 - Prob. 22PCh. 39 - Prob. 23PCh. 39 - Prob. 24PCh. 39 - Prob. 25PCh. 39 - Prob. 26PCh. 39 - Prob. 27PCh. 39 - Prob. 30PCh. 39 - Prob. 31PCh. 39 - Prob. 32PCh. 39 - Prob. 33PCh. 39 - Prob. 35PCh. 39 - Prob. 37PCh. 39 - Prob. 38PCh. 39 - Prob. 39PCh. 39 - Prob. 40APCh. 39 - Prob. 41APCh. 39 - Prob. 43APCh. 39 - Prob. 44APCh. 39 - Prob. 45APCh. 39 - Prob. 46APCh. 39 - Prob. 47CPCh. 39 - Prob. 48CPCh. 39 - Prob. 49CPCh. 39 - Prob. 50CP
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- Suppose a star with radius 8.57 × 108 m has a peak wavelength of 680 nm in the spectrum of its emitted radiation. (a) Find the energy of a photon with this wavelength. J/photon (b) What is the surface temperature of the star? K (c) At what rate is energy emitted from the star in the form of radiation? Assume the star is a blackbody (e = 1). W (d) Using the answer to part (a), estimate the rate at which photons leave the surface of the star. photons/sarrow_forwardModel the tungsten filament of a lightbulb as a black body at temperature 2 900 K. (a) Determine the wavelength of light it emits most strongly. (b) Explain why the answer to part (a) suggests that more energy from the lightbulb goes into infrared radiation than into visible light.arrow_forwardA blackbody is radiating at a temperature of 2.10 x 103 K. (a) What is the total energy density of the radiation? 9.18e16 eV/m3 (b) What fraction of the energy is emitted in the interval between 1.50 and 1.55 eV? (Give your answer in decimal or scientific notation.) 1.662e-17 (c) What fraction is emitted between 10.25 and 10.30 eV? (Give your answer in decimal or scientific notation.) 5.448e-19arrow_forward
- The radius of our Sun is 6.96 x 10° m, and its total power output is 3.85 x 1014 terawatt (TW)- a) Assuming the Sun's surface emits as a black body, calculate its surface 15 temperature. b) Using the result of part (a), find Amax for the Sun. c) If the sun works as transmitter, how many photons per second does the sun emit at Amax?arrow_forwardAn astronomer observes the spectrum of a distant star and notices that the Hydrogen alpha absorption line appears with a wavelength of 590.4 nm. This spectral line has a wavelength of 656 nm when measured in the laboratory. Choose the option below that most plausibly explains this observation. Select one: а. Some intervening material must be imposing an unusual absorption spectrum on the star's continuum radiation O b. The star is moving towards the observer with a speed of 10% of the speed of light. О с. The star is moving away from the observer with a speed of 10% of the speed of light O d. The star is moving towards the observer with a speed 10 m/s O e. The star has a very hot atmosphere е. that changes the wavelengths of the spectral linesarrow_forwardThe intensity of blackbody radiation peaks at a wavelength of 613 nm. (a) What is the temperature (in K) of the radiation source? (Give your answer to at least 3 significant figures.) K (b) Determine the power radiated per unit area (in W/m?) of the radiation source at this temperature. W/m2arrow_forward
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