A light source is a physical term that refers to an object that can emit electromagnetic waves (including visible light and invisible light such as ultraviolet, infrared, and X-ray) within a certain wavelength range. Usually, it refers to objects that emit visible light. Light sources can be divided into natural light sources (natural light sources) and artificial light sources. The sun, turned on electric lights, burning candles, etc. are all light sources&Nbsp The first type is light generated by thermal effects. Sunlight is a good example, and candles and other items are also the same. This type of light changes color with temperature The second type of atomic transition emits light. The fluorescent substance coated on the inner wall of a fluorescent lamp tube is excited by electromagnetic wave energy to produce light. In addition, the principle of neon lights is also the same. Atomic luminescence has its own characteristic spectral lines. Scientists often use this principle to identify the types of elements
Radiative luminescence
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