Print the grid (the one that's posted as a separate pdf called energy level grid) in order to make side-by-side energy level diagrams in separate columns for hydrogen, for once-ionized helium, and for twice-ionized lithi, according to the bohr theory. use the same energy scale for all three diagrams. the scale is already fixed- the fraction-1/36 on the grid locates the 1に6 level for hydrogen itself. specifically, you are to show the locations of levels n 4, 6, 8, and 12. note 1: not al levels will fit on the grid, so just show levels that do fit. note 2: consider making copies of the pdf grid in case you need to discard a few that get messed up, because full credit for the answen to this problem is only given for use of that grid

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. a) what is the block's initial mechanical energy? b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?