Which of the following phenomena is not thought to be a result of collisions or other interactions between galaxies?
A) the presence of large, central dominant galaxies in clusters of galaxies
B) the fact that elliptical galaxies are more common in clusters of galaxies than outside clusters
C) starbursts
D) the fact that spiral galaxies have both disk and halo components
D) the fact that spiral galaxies have both disk and halo components
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Light shines through atomic Hydrogen gas. It is seen that the gas absorbs light readily at a wavelength of 91.33 nm
What is the level to which the Hydrogen is being excited by the absorption of light of this wavelength? Assume that the most of the atoms in the gas are in the lowest level. A) 25 B) 27 C) 22 D) 32
With no water and a thick, slow-moving lower atmosphere, there is little erosion on Venus
a. True b. False Indicate whether the statement is true or false
Atmospheric molecules do not fly off into outer space due to
A) their chaotic speeds. B) their relatively low densities. C) Earth gravitation. D) cohesive forces.
Is it possible to add energy to an isolated material and not have the material's temperature change?
1.No, the material's temperature will always go up when energy is added to it. 2.No, the material's temperature will sometimes go up and sometimes go down when energy is added, but it will always change. 3.Yes, temperature change is not a function of energy added to a material. 4.Yes, in some cases a material's temperature will change when energy is added to the material. In other cases, the material's temperature will not change when energy is added.