To create the above spectra, which of the following is NOT true?
a. A dense gas is excited and the light produced is over all wavelengths.
b. A low-density gas is excited and the light produced is over discrete wavelengths.
c. Light from a low-density gas passes through a warm, dense gas and the light that is produced is at all wavelengths except for a few discrete wavelengths.
d. All of the other choices are not true.
D
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What evidence suggests that most of the mass of the Milky Way is in the form of dark matter?
A) The orbital speeds of stars far from the galactic center are surprisingly high. B) Although dark matter emits no visible light, we have detected its radio emissions. C) Theoretical models of galaxy formation suggest that a galaxy cannot form unless it has at least 10 times as much matter as we see in the Milky Way disk. D) Our view of distant galaxies is often obscured by dark blotches, which are presumably made of dark matter.
The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal contact and the combination is isolated. The final temperature of both objects is:
A. 200 K B. 300 K C. 400 K D. 450 K E. 600 K
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The acceleration of the ball in m/s2 is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
What is the potential at a distance of 0.0529 nm from a proton?
A. 13.6 no B. -13.6 no C. 27.2 V D. -27.2 no E. 9.11 pC