4. Is a He+ 5-d transition in the visible range? Calculate and explain. 5. Are there any electronic transitions of He involving energy levels 1, 2 and 3 which are in the visible range? That is, will He emit any visible photons when the electrons fall from any level to levels 1, 2, and 3? If not, show why. If so, cal- culate the wavelengths in A for the visible photon(s) and the approximate color of each photon.
Show transcribed image text4. Is a He+ 5-d transition in the visible range? Calculate and explain. 5. Are there any electronic transitions of He involving energy levels 1, 2 and 3 which are in the visible range? That is, will He emit any visible photons when the electrons fall from any level to levels 1, 2, and 3? If not, show why. If so, cal- culate the wavelengths in A for the visible photon(s) and the approximate color of each photon.