What is the Hubble constant essentially a measure of?
a. The number of galaxies in the universe.
b. The expansion of the universe.
c. The age of the Milky Way galaxy.
d. The amount of dark matter in an average galaxy.
B
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What wavelength corresponds to the n = 2 ? n = 1 transition in singly-ionized helium?
A) 15.2 nm B) 22.8 nm C) 4.56 nm D) 11.4 nm E) 30.4 nm
The moist greenhouse effect refers to
A) the warming process by which water vapor rises into the upper atmosphere above the ozone layer where it is then broken apart by ultraviolet radiation B) the point at which water is evaporating from the surface at a faster rate than it is condensing C) the natural greenhouse effect due to clouds of water vapor in the lower atmosphere D) an enhanced greenhouse effect above tropical regions of the Earth's surface
A magnifying lens has a focal length of 10 cm. A person has a near point of 25 cm
(a) What is the magnification of the lens for that person when their eyes are focused at infinity? (b) What is the magnification of the lens for that person when their eyes are focused at their near point?
Rocks are found on the surface of another planet which appear to have been formed at the bottom of an ancient ocean. Given this, they are most likely to be classified as
A) metamorphic B) igneous C) meteoritic D) sedimentary