Do question 2 and 19 all parts and show work or thumbs down

2. (a) Calculate the mass of a proton using the charge-to-mass ratio given for it in this chapter and its known charge. (b) How does your result compare with the proton mass given in this chapter? 19. A wavelength of 4.653 um is observed in a hydrogen spectrum for a transition that ends in the nf=5 level. What was ni for the initial level of the electron? 21. A beryllium ion with a single electron (denoted Be3+) is in an excited state with radius the same so that of the or