ocr: Spectrum - - - - - - - - - - - @ 1 - The red line in the atomic is caused by electrons spectrum dropping from the 3rd orbit tot the 2nd orbit - - - - - - - - - - - - - - - - - - - - - - * - - - - - - - - - - - (@ The blue line in the atomic spectrum is causedby electrons dropping from the 5th orbit 1 tot the 2nd orbit. Nucleus O Electron Photon of light