The highest atmospheric layer in the Sun is the _______
a. photosphere b. corona
c. chromosphere d. prominence
b
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What is this galaxy doing that keeps it from being idle?
A: The black hole at the center of the disk is sucking in the stars in the disk, which is gradually disappearing. B: It is fragmenting into different irregular parts as the universe evolves. C: It is oscillating between compressed and rarefied states, changing by a factor of two in size every million years. D: Stars are forming in the spiral arms and the disk is rotating. E: The galaxy evaporates quickly so that it will only be around for another million years.
The pressure exerted by a gas is the result of
a. the Bernoulli effect. b. molecular collisions. c. Pascal's principle. d. the ideal gas law. e. none of the above.
A hydrogen atom is in the 6h state. What is the principal quantum number
A) 0 B) 3 C) 5 D) 6 E) 7
The base SI unit of length is
A) millimeter. B) centimeter. C) meter. D) kilometer. E) megameter.