This energy is released as a photon. The energy of the photon can be worked out using the equation If an electron moves from level \(E_{2}\) to \(E_{1}\) the energy of the photon can be worked out ...

the energy of a photon resulting from an electron transitioning from one hydrogen hyperfine energy level to another. The effect was first detected by Willis Lamb and Robert Retherford in 1947 ...