5. One of the lines in the emission spectrum of hydrogen has a wavelength (A) of 397 nm. This lines comes from an upper energy level down to n 2. Calculate the principal quantum number of this upper level.
Show transcribed image text5. One of the lines in the emission spectrum of hydrogen has a wavelength (A) of 397 nm. This lines comes from an upper energy level down to n 2. Calculate the principal quantum number of this upper level.