What happens when the electron moves from the first energy level to the second energy level?
energy is absorbed, and an emission line is produced.
energy is released, and an emission line is produced.
energy is absorbed by the atom.
energy is lost from the atom.

Atank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. the values in the table show the volume v of water remaining in the tank (in gallons) after t minutes. t(min) 5 10 15 20 25 30v(gal) 694 444 250 111 28 0(a) if p is the point (15, 250) on the graph of v, find the slopes of the secant lines pq when q is the point on the graph with t = 5, 10, 20, 25, and 30.(b) estimate the slope of the tangent line at p by averaging the slopes of two secant lines.(c) use a graph of the function to estimate the slope of the tangent line at p. (this slope represents the rate at which the water is flowing from the tank after 15 minutes.)show all steps.

Idon’t quite understand this problem

Aball has an initial velocity of 3 m/s. if there is no friction, what is the highest it could roll?