If the transition just fills the vacancy in the orbit and reaches the stable state from the excited state, the electron will not move. Otherwise, the electrons will jump back to the previous orbit again and release energy in the form of waves.
There are three laws of light propagation:
The linear propagation law of (1) light has been described above. Geodetic survey is also based on this.
(2) The law of independent propagation of light. When two beams of light meet in the process of propagation, they do not interfere with each other, but continue to spread in their own ways. When two beams of light converge at the same point, the light energy at that point simply adds up.
(3) The laws of reflection and refraction of light. When light meets the interface of two different media on the way, some light is reflected and some light is refracted. Reflected light follows the law of reflection and refracted light follows the law of refraction.
Expand the related concepts of data light: light source
light source
An object that is emitting light is called a light source and must meet the condition of "existence". The light source can be natural or artificial. Physically, it refers to an object that can emit electromagnetic waves in a certain wavelength range (including visible light and ultraviolet light, infrared light, X-rays and other invisible light). Light sources can be mainly divided into three categories.
The first is the light produced by thermal effect. Sunshine is a good example, because the surrounding environment is lower than the temperature of the sun. In order to achieve thermal balance, the sun will release energy in the form of electromagnetic waves until the surrounding temperature is the same as it is.
The second category is atomic transition luminescence. The fluorescent substance coated on the inner wall of the fluorescent tube is excited by electromagnetic wave energy and emits light. In addition, the principle of neon lights is the same. Atomic luminescence has its own characteristic spectral lines. Scientists often use this principle to determine the types of elements.
The third category is the light generated by the accelerated motion of charged particles in matter. For example, synchrotron emits synchrotron radiation when it works, and it also carries powerful energy. In addition, the pale blue shimmer (Cherenkov radiation) emitted by atomic furnaces (nuclear reactors) also belongs to this category.
Baidu Encyclopedia-Light (duality of light waves)