Its discovery provided the first empirical proof that photons have momentum. Its namesake detected it by passing a beam of x-rays through a block of wax and showing that the scattered radiation had a 
Its discovery provided the first empirical proof that photons have momentum. Its namesake detected it by passing a beam of x-rays through a block of wax and showing that the scattered radiation had a longer wavelength than the primary waves. FTP, identify this effect named for an American physicist where photons lose kinetic energy in collisions with electrons.
Its discovery provided the first empirical proof that photons have momentum.
the {Compton} effect