According to bohr model, the attraction force between electron and nucle. These topics form the basis of modern physics. However, this theory was more of a philosophical concept than a scientific one.
Atoms absorb or emit radiation only when the electrons abruptly jump between allowed, or stationary, states. Each time the electron changes orbit, it emits or absorbs energy in fixed quantities calledquanta. The physicist Niels Bohr said, Anyone who is not shocked by quantum theory has not understood it. However, researchers discovered more frequencies named fine structure than those were measured and also predicted by Bohr, which means Bohrs model is not enough to explain the spectrum. This is the value of the wavelength of the red band observed in the spectrum of hydrogen lines.