jujube cake model explains the method of triboelectrification: The viewpoint of jujube cake model is that except electrons, the mass and positive charges of atoms are evenly arranged like cakes, and electrons are randomly embedded in cakes like dates. Physicists have discovered the phenomenon that atoms can excite a substance by studying cathode rays. Whether this substance is a particle or an electromagnetic wave has different opinions. Tang Musun found that the substance was deflected by vertical electric field (that is, it was proved that the substance was charged), and the charge-mass ratio of different substances after excitation was fixed. This completely negates the electromagnetic wave hypothesis of Hertz and others. Since the cathode can excite this smaller particle, it shows that the metal atom of the cathode can be divided. The meaning of atom in ancient Greek is the smallest pull that cannot be divided. Atoms can be divided. In order to study the composition of atoms, Tang Musun proposed the jujube cake model.