Some galaxies in the Local Group stopped forming stars for several billion years but then started again
Indicate whether the statement is true or false
TRUE
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The diameter of a nitrogen molecule is about 0.29 nm. In a tank of nitrogen at a pressure of 2.5 atm and temperature 273 K, what is the mean free path of a nitrogen molecule?
A. 39 nm B. 56 nm C. 177 nm D. 125 nm
Which statement about motion in the universe is not true?
A) The mysterious dark matter is the fastest-moving material in the universe. B) Some stars in the Milky Way Galaxy are moving toward us and others are moving away from us. C) Except for a few nearby galaxies, all other galaxies are moving away from us. D) Your speed of rotation around Earth's axis is faster if you live near the equator than if you live near the North Pole.
Pumped storage generally will enable a utility to _______
a. increase the efficiency of their electrical generating system b. store energy until the demand is high enough c. raise electrons to higher energy states d. increase their electrical potential energy
When photons of electromagnetic radiation bounce off of a surface they are said to be
A) emitted B) refracted C) absorbed D) reflected