7/25/2019 01b_tambahan Bab 11

http://slidepdf.com/reader/full/01btambahan-bab-11 1/3

when m0 = 0,  E = pc = mc2 = hν 

and the momentum of photon should be

7/25/2019 01b_tambahan Bab 11

http://slidepdf.com/reader/full/01btambahan-bab-11 2/3

A phenomenon called Compton scattering,

first observed in 1924 by Compton,

provides additional direct confirmation ofthe quantum nature of electromagnetic

radiation. When !rays impinges on

matter, some of the radiation is scattered,

 "ust as the visible light falling on a rough

surface undergoes diffuse reflection.

#bservation sho$s that some of the

scattered radiation has smaller frequency

and longer $avelength than the incident

radiation, and that the change in

$avelength depends on the angle through

$hich the radiation is scattered.%pecifically, if the scattered radiation

emerges at an angle & $ith the respect to

the incident direction, and if and are

the $avelength of the incident and

scattered radiation, respectively, it isfound that

7/25/2019 01b_tambahan Bab 11

http://slidepdf.com/reader/full/01btambahan-bab-11 3/3

called Compton wavelength.