The laser in an audio compact disc player uses light with a wavelength of 7.80x10e+2 nm. What is the frequency of this light (in Hz)? What is the energy of a single photon of this light?

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:

the answer is 75.0%.