Inquiry into Physics
8th Edition
ISBN: 9781337515863
Author: Ostdiek
Publisher: Cengage
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Chapter 10, Problem 3C
The rate at which solar wind particles enter the atmosphere is higher during the day than at night, yet the intensity of the auroral emissions remains high well after the Sun has set. Can you suggest a means by which the atmospheric molecules might be able to
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If a sunspot has a temperature of 4,270 K and the average solar photosphere has a temperature of 5,780 K, how many times more energy is emitted in 1 second from a square meter of the photosphere compared to a square meter of the sunspot? (Hint: Use the Stefan-Boltzmann law,
E = σT4 (J/s/m2)
where E is the energy, σ is a proportionality constant equal to 5.67 ✕ 10−8 J/s/m2/K4, and T is the temperature in kelvins.)
The surface temperature of the Sun is about 6000K. For this question, assume it is exactly 6000K.
Now suppose that the surface temperature of the Sun was 12,000 K, rather than 6,000 K.
a) How much more thermal radiation would the Sun emit, compared to its current output?
Answer as a whole number, which is the ratio of the new to the old output.
b) Using Wein's law, λ (nm) = 3 x 10^6 / T(K), calculate the peak wavelength of the light that is emitted by the Sun with its new temperature.
Answer as the nearest whole number, when expressed in nm.
c) In which electromagnetic band would the thermal radiation spectrum of the Sun peak?
Use Wein's law to determine the wavelength corresponding to the peak of the black body curve (a) in the core of the Sun, where the temperature is 10^7, (b) in the solar convection zone (10^5), and (c) just below the solar photosphere (10^4K). What form (visible, infrared, X-ray, etc.) does radiation take in each case?
Chapter 10 Solutions
Inquiry into Physics
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- The text says that the Local Fluff, which surrounds the Sun, has a temperature of 7500 K and a density 0.1 atom per cm3. The Local Fluff is embedded in hot gas with a temperature of 106 K and a density of about 0.01 atom per cm3. Are they in equilibrium? (Hint: In pressure equilibrium, the two regions must have nT equal, where n is the number of particles per unit volume and T is the temperature.) What is likely to happen to the Local Fluff?arrow_forwardSuppose you live in northern Canada and an extremely strong flare is reported on the Sun. What precautions might you take? What might be a positive result?arrow_forwardHow many watts of radiation does a 1-meter square region of the Sun's photosphere emit at a temperature of 500 K ? How much would the wattage increase if the temperature was doubled?arrow_forward
- What is the power consumption for Cloud Chamber Scrubber?arrow_forwardThe sun can be treated as a blackbody at an effective surface temperature of 10,400 R. Determine the rate at which infrared radiation energy (l = 0.762100 mm) is emitted by the sun, in Btu/h·ft2.arrow_forwardIf the emitted infrared radiation from Pluto, has a wavelength of maximum intensity at 75,000 nm, what is the temperature of Pluto assuming it follows Wien’s law?arrow_forward
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