Strengthen blood flow locally: used to strengthen chest, back, waist and abdomen, etc. , dredge the meridians and promote the blood circulation speed of hematopoiesis.
1905, Albert Einstein further proposed that light wave itself is not continuous but particle-like, which Einstein called light quantum; 1923a.h. Compton successfully explained the Compton effect of wavelength change when X-rays were scattered by matter with the concept of optical quantum, so the concept of optical quantum was widely accepted and applied, and was officially named photon in 1926.
Extended data:
According to the calculation:
Neutron mass:1.67411(84) ×10-27 kg; Neutron radius:1.11337557 (48) fermi;
Proton mass:1.67221637 (83) ×10-27 kg; Proton radius:1.11286448 (48) Fermi;
Electronic mass: 9.10938215 (45) ×10-31kg; Electron radius: 0.0908809 14(40) fermi;
Photon mass: 9.347543 (38) ×10-36 kg; Photon radius: 0.0 03 1349374(29) Fermi.
Photon energy: 4.200577 (17) ×10-19 joules, 2.621794 (1) electron volts, frequency: 6.339477.
Baidu encyclopedia-photon energy