What is the mass of exactly 1 million helium atoms? The atomic mass of helium is 4.00 u.
A. 
B. 
C. 
D. 
C.
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If the density of the Universe is ________ than the critical density, then the Universe will ________.
A. larger; expand forever B. larger; eventually collapse in a "Big Crunch" C. less; eventually collapse in a "Big Crunch" D. less; not change in size
A uniform film of oil (n = 1.31) is floating on water. When sunlight in air is incident normally on the film, an observer finds that the reflected light has a brightness maximum at ? = 450 nm and a brightness minimum at ? = 600 nm. What is the thickness of the oil film?
The Appalachian Mountains in the eastern United States are examples of ______________ mountains
Fill in the blank(s) with correct word
One of the main reasons the Hubble Space Telescope was built and launched was to measure how fast the universe is expanding. If the expansion turns out to be faster than we thought, our estimate for the age of the universe will be
A) older (more time between now and the Big Bang). B) younger (less time between now and the Big Bang). C) unaffected.