Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 5, Problem 49Q
To determine

(a)

The change occurs in the appearance of sky if human eye can see ultraviolet radiation.

To determine

(a)

The change occurs in the appearance of sky in daytime if human eye can see infrared radiation.

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A tungesten filament is heated to 3000.0 ∘∘C. Calculate the wavelength for which the emission spectrum of the filament is maximum assuming that it fully absorbes light at all wavelengths.
(b) Following up on part (a), calculate the energy (in J) of a typical photon. Assume for this approximate calculation that each photon has the wavelength calculated in part (a). The hc where h is Planck's constant and is equal to 6.626 x 10-34 Jxs, c is the speed of light in m/s, and is the wavelength in m. energy of a photon is given by E = λ
3) How bright will Pluto appear in reflected or scattered sun-light (total Flux received in W/m²) at the Earth when Pluto is at Opposition and a distance from the Sun of 40.0 A.U.? Assume that Pluto has an albedo of 0.60 and a radius of 1.2 x 10³ km.
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