The highest energy level in an atom is its
a. ionization level
b. emission level
c. absorption level
d. photon level
e. ground state
A
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The Hertzprung—Russell diagram is a plot of
A) radial velocity against distance B) apparent brightness against time C) luminosity against distance D) luminosity against surface temperature
The point P lies along the perpendicular bisector of the line connecting two long straight wires S and T that are perpendicular to the page. A set of directions A through H is shown next to the diagram. When the two equal currents in the wires are directed up out of the page, the direction of the magnetic field at P is closest to the direction of
A. E. B. F. C. G. D. H. E. A
Copernicus proposed his theory because
A) he thought that Ptolemy's theory was too messy and that his was more "fitting." B) it was obvious to most educated people by that time that Earth orbits the sun. C) Ptolemy's theory was known to be wrong. D) it was more in line with Church thinking than was the pre-Christian Greek theory. E) it fit the data taken by Tycho Brahe.
Rank the following events in the order that corresponds to the formation of a planetary system.
What will be an ideal response?