Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 15, Problem 2CLC
To determine
The length of the tail of a meteor that passes through the upper Earth’s atmosphere at a speed of 5 km/s, if the meteor gets heated while travelling through the atmosphere and is visible for 1 s.
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The fraction of the energy flux received which is reflected into space is the albedo of Venus, av, which is about 0.76. The fraction of the energy flux which is absorbed is then (1-av) = 1. - 0.76 = 0.24. So the amount of energy actually absorbed by Venus in each second is Lv = (1-av)Ev.
Lv = (1-av)Ev = ___________________ ergs/s
And next calculate the effective temperature of Venus:
Tv4 = (Lv/(4pdv2))/s = Lv/(4spdv2) = __________________ K4
and taking the square root of Tv4 twice in succession we get the effective Temperature Tv:
Tv = [Lv/(4spdv2)]0.25 = _________________ K
Calculate Venus' emittance assuming that the Venus' actual temperature, Tvr, is 472o C = 745 K:
ev = Lv/(4pdv2s Tvr4) = __________________ .
What is the value of the IR transmission factor (f) for a Venus-like planet, if the
measured average surface temperature is 706 K? Assume the following values for the
planet: E, = 2.60x10³ W m² and a = 0.71.
Would the average temperature increase or decrease if f decreased?
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Chapter 15 Solutions
Universe
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