The above visual wavelength image is of a ___________, which is a(n) _________
a. dark nebula, empty space
b. reflection nebula, dark cloud
c. Bok globule, empty space
d. emission nebula, dark cloud
C
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When all the colors of the rainbow can be seen in
a spectrum and no individual bright or dark lines are visible, the spectrum is called a)an emission spectrum. b)a continuous spectrum. c)a chromatic spectrum. d)an absorption spectrum.
What is different between a particle and its antiparticle?
a. opposite electric charge b. opposite strangeness c. opposite charm d. all of the above
Suppose we want a satellite to revolve around the earth 5 times a day. What should be the radius of its orbit? (The mass of the earth is 5.97 × 1024 kg, G = 6.67 × 10-11 N ? m2/kg2, and you can neglect the presence of the moon.)
A) 1.44 × 107 m B) 0.690 × 107 m C) 7.22 × 107 m D) 2.11 × 107 m
Based on its distance from the Sun, we would expect the surface of Venus to be
A) much hotter than the Earth B) much colder than the Earth C) a little hotter than the Earth D) the same temperature as the Earth