In the classical view of the atom, bohr pictured electrons orbiting the positively charged nucleus similar to how the planets orbit the sun. while this picture was not entirely correct, it provides a good framework in which to make calculations about the energies of electrons. different from the predictions of newtonian mechanics, which allows any energy to be possible, bohr described the electron orbits (now called orbitals) as having specific energies. rank the following electron energy states according to their electron energies.
rank from highest to lowest energies.
- first excited state- ground state
- third excited state
- second excited state

People with normal vision cannot focus their eyes underwater if they aren't wearing a face mask or goggles and there is water in contact with their eyes. in a simplified model of the human eye, the aqueous and vitreous humors and the lens all have a refractive index of 1.40, and all the refraction occurs at the cornea, whose vertex is 2.60 cm from the retina.with the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 2.05cm in front of the eye.)