Question 2 (1 point) A quantum of energy is the
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frequency of electromagnetic energy given off by an atom.
wavelength of electromagnetic energy gained by an atom.
minimum quantity of energy that can be lost or gained by an atom.
continuous spectrum of energy given off by an atom.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: