The highest atmospheric layer in the Sun is the _______
a. photosphere b. corona
c. chromosphere d. prominence
b
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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.
The base SI unit of length is
A) millimeter. B) centimeter. C) meter. D) kilometer. E) megameter.
A hydrogen atom is in the 6h state. What is the principal quantum number
A) 0 B) 3 C) 5 D) 6 E) 7
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.