Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 5, Problem 49Q
(a)
To determine
The appearance of the night sky and ordinary objects during daytime, if we could see ultraviolet
(b)
To determine
The difference in the appearance of the night sky and the ordinary objects in the daytime, if we could see infrared radiation.
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The ratio of velocities of visible light of wavelength 5000 A and infrared ray of
wavelength 8500 A in free space is,
(a) Greater than 1
(b) Less than 1
(c) Equal to 1
(d) Infinite
If you see a red-hot star, you can be certain that its peak intensity is in the infrared region. Why is this?
(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
Chapter 5 Solutions
Universe
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