Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 5CC
To determine
The temperature at which the object emits more infrared
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How many watts will be radiated from a spherical black body 15 cm in diameter at a temperature of 900°C?
An infrared satellite measures outgoing radiation that leaves Earth's surface through an atmospheric window. The observed spectral irradiance at a wavelength of 10 μm is 2.199×107 W m-2 m-1. What is the temperature of the surface? Give your answer in K.
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Chapter 5 Solutions
Universe
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- Auroras are caused by collisions between particles such as electrons released by the Sun, and atoms in a planet’s atmosphere. These collisions transfer energy to the atmospheric atoms causing them to emit specific colors (wavelengths) of light. On Earth, auroras occur in a layer of the atmosphere known as the ionosphere, 80 km to 400 km above the surface. If solar activity increases, the number of sunspots increases, and more particles are released by the Sun. If, on average, there were 150 sunspots in 2014, 5 in 2020, and 160 in 2023, which year(s) will have the most auroras, and which year(s) the least? Can you explain why? Answer:arrow_forwardWhat is the maximum wavelength emitted by a blackbody whose temperature is 2900 Karrow_forwardThe Sun has a temperature of approximately 5800 K. a) What is the peak wavelength of light emitted by the Sun? b) How much energy does one photon of this wavelength have? c) How much power is emitted by the Sun if it has an emissivity of 0.9? (The Sun has a radius of 6.96x10^8 m.) d) How much mass is converted to energy every second in the Sun's core to drive its power emission? Please write your answers in the space below and email your work. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac).arrow_forward
- The Sun has a temperature of approximately 5800 K. a) What is the peak wavelength of light emitted by the Sun? b) How much energy does one photon of this wavelength have? c) How much power is emitted by the Sun if it has an emissivity of 0.9? (The Sun has a radius of 6.96x10^8 m.) d) How much mass is converted to energy every second in the Sun's core to drive its power emission? Please write your answers in the space below and email your work. ALT+510(BOLO ALTHEN+510 (Mac)arrow_forwardThe spectrum of light from a star is, to a good approximation, a blackbody spectrum. The red supergiant star Betelgeuse has Amax = 760 nm. (Note that this is actually in the infrared portion of the spectrum.) When light from Betelgeuse reaches the earth, the measured intensity at the earth is 2.9 X 10-8 W/m². Betelgeuse is located 490 light years from earth. (a) Find the temperature of Betelgeuse. (b) Find the intensity of light emitted by Betelgeuse. (Hint: Remember that this and the measured intensity at the earth are related by an inverse square law.) (c) Find the radius of Betelgeuse. (Assume it is spherical.)arrow_forwardA particular blackbody has a radiation spectrum that peaks at a wavelength of 660 nm. Part (a) What is the temperature of the blackbody in units of Kelvin? Part (b) If the temperature of a blackbody is 4300 K, at what wavelength, in units of nanometers, does it radiate the most energy?arrow_forward
- The Sun is at a 62 degree angle to the ground and a solar module with an area of 1 square metre is installed horizontal to the ground. What is the total usable solar energy striking the module if we assume incoming solar radiation of 1000 W/m2? 883 watts 469 watts 1136 watts 620 wattsarrow_forwardWhat is the peak wavelength of a blackbody with a temperature of 9000 K?arrow_forwardAs an object is heated, the peak in its thermal emission spectrum may shift out of the visible part of the spectrum. Does this make the object invisible? Why or why not?arrow_forward
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