- The wavelength of the line that corresponds to n2=5 in the Lyman series of the hydrogen atom is: * 1924nm. 95nm. 110nm. 121.6nm. - What is the speed (v) in cm/s of a proton (mass =1.661021g ) that has the same linear momentum as a photon with wavelength of 434nm ? * v=1021cm/s=91.9cm/sv=72.6cm/sv=61.7cm/s - For the hydrogen atom what is the degeneracy of the third energy level? En=A2. A is a constant. * 3 * 6