1. The problem statement, all variables and given/known data In the Balmer series, how many spectral lines have the wavelength greater than 400 nm? 2. Relevant equations 1/lambda= R(1/2^2-1/n^2) lambda=wavelength r=rhydberg constant 1.097x10^7 n= 3,4,5.... balmer series is visible light 3. The attempt at a solution ok so i know the balmer series starts with 400 nanometers because its visible light, but i dont understand how to see how many spectral lines have wavelength greater.