When the electromagnetic wave propagates, when the band radius is close to the radius of the object, the energy will be transferred. So it is easy to explain the diffraction ability and penetration of frequency. First of all, there is no energy loss in vacuum. The lower the frequency, the longer the band, so it is difficult for molecular atoms to gain energy, so it is more difficult to lose energy. The specific performance is that the diffraction ability is stronger. The higher the frequency, the smaller the band, the closer to the radius of molecular atoms, and the easier it is to transfer energy. The specific performance is that the stronger the penetration. (In the air environment, long wave is used, that is, the band with strong diffraction ability is adopted, and the atomic density of air molecules is not enough, so it is easy to diffract and difficult to penetrate; In the solid environment, the use of short wave, that is, the band with strong penetration ability, has high molecular atom density, which is convenient for energy transfer to molecular atoms, and the space for energy movement is smaller. ) Wavelength λ=C/f C is the speed of light λ is the wavelength f is the frequency of electromagnetic waves. Therefore, the lower the frequency and the longer the wavelength, the stronger the diffraction ability; The higher the frequency, the shorter the wavelength and the worse the diffraction ability.