When an electron drops to a lower energy level in an atom, but no other interactions take place
A) the atom may emit a photon of light of a specific wavelength.
B) the total energy of the atom remains unchanged.
C) the atom must slow its speed moving through space.
D) the atom must increase its speed moving through space.
E) the electron must become slightly more massive.
A) the atom may emit a photon of light of a specific wavelength.
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