Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 17Q
To determine
The reason for the change in colour and intensity as the temperature of a hot and glowing object increases using Wein’s Law and Stefan-Boltzmann Law.
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Use Wien's Law to calculate the peak wavelength of light coming from the Sun. Assume T=5800 K for the surface temperature of the Sun. Wein's displacement law says that the blackbody temperature and peak wavelength multiplied together give a constant of 0.29 cm-K. (K is degrees Kelvin).
Convert the wavelength from part A into a frequency. The product of wavelength and frequency for electromagnetic radiation is a constant, the speed of light (c), 3 x 10^10 cm/s.
Explain Stefan-Boltzmann law of radiation?
For the wavelength of maximum emission being 17 micrometers,find the temperature of the object and total amount of energy emitted. (Wiens Law and Stefan-Boltzmann's Law will be useful here)
Chapter 5 Solutions
Universe
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- What is the temperature of a star whose maximum light is emitted at a wavelength of 290 nm?arrow_forwardDetermine the power intensity of radiation per unit wavelength emitted at a wavelength of 500.0 nm by a blackbody at a temperature of 10,000 K.arrow_forwardState Stefan-Boltzmann law. Give its value in SI units.arrow_forward
- What wavelength (in nanometers) is the peak intensity of the light coming from a star whose surface temperature is 8888 Kelvin? Calculate total energy radiated per unit area by a black body at this temperature.arrow_forwardIn the spectrum of a blackbody, the wavelength of peak intensity (a) decreases as temperature increases. (b) increases as temperature increases. (c) is independent of temperature.arrow_forwardThe surface temperature of a star is measured to be 6000 Kelvin. According to Wien's Displacement Law, at what wavelength does the star emit the maximum intensity of radiation?arrow_forward
- Suppose you are working with a photosensitive material that you know is sensitive to green light, but you do not know whether it is sensitive to any other colors. If you must work with the material in some kind of light that you can see, what would be more likely to damage the material, red light of high intensity, or purple light of low intensity?arrow_forwardThe wavelength of a particular ultraviolet radiation from hydrogen atoms is 1.216 × 10-7 m. Calculate the wavelength when the corresponding radiation from hydrogen in a distant galaxy is observed here on earth. The galaxy is receding at a speed of 0.08 c.arrow_forwardAstronomers determine the surface temperature of a star by measuring its brightness at different frequencies. Explain how they can then use the Planck radiation law to obtain the surface temperature.arrow_forward
- According to Wien's Displacement Law, the wavelength of maximum emission of a body with a temperature of 357 Kelvin would be:arrow_forwardThe spectral emittance curve for the star Rigel A is a good approximation of the curve for a blackbody. The maximum of this curve is at 239 nm. Find (a) the surface temperature of Rigel A and (b) the power that Rigel A radiates per unit surface area.arrow_forward
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