More recent experiments have definitely ruled out the emission model: the earliest were those of Filippas and Fox (1964), using moving sources of gamma rays, and Alväger et al. (1964), which demonstrated that photons didn't acquire the speed of the high speed decaying mesons which were their source.
More recent experiments have definitely ruled out the emission model: the earliest were those of Filippas and Fox (1964),со користење на подвижни извори на гама зраци, и Alväger et al. (1964), кој покажа дека фотоните не се стекна со брзината на мезоните со распаѓање со голема брзина, кои беа нивниот извор.