Question

Is the line spectrum of an atom the result of one electron transition or many?

Answer 1

Line spectra or atomic spectra are defined as atoms emit light of certain wavelength when they are in excited state. The emitted light can be observed as a series of colored lines with dark spaces in between so it is called line spectra. Each element produces an exclusive set of spectral lines. When light (photon) is fall on an atom, the electrons present in the atom gain some energy by absorbing the photons. Because of this energy gain the electrons will jump to higher energy levels. The higher the energy of the photon absorbed, the higher the energy level the electron jumps to. When the electrons come down the normal state, it releases some energy as photon. That will show as line spectra. Here one electron or more electrons are responsible for the process. Eg. Line spectrum of hydrogen