Compton effect, increase in wavelength of X-rays and other energetic electromagnetic radiations that have been elastically scattered by electrons; it is a principal way in which radiant energy is absorbed in matter.

The basic difference between the Compton effect and the photoelectric effect, the Compton effect occurs on the free electrons while the photoelectric effect occurs on the bound electrons. In the Compton effect, the photons are scattered by the electrons.

Compton scattering, discovered by Arthur Holly Compton, is the scattering of a photon by a charged particle, usually an electron. If it results in a decrease in energy (increase in wavelength) of the photon (which may be an X-ray or gamma ray photon), it is called the Compton effect.

A lone electron cannot be created because of lepton number conservation, it has to come with an antielectron or be part of a decay process, like the decay of the muon where the electron number is conserved by the creation of an antineutrino-electron. The rest mass energy of an electron is 511 keV.

Light is composed of photons, so we could ask if the photon has mass. The answer is then definitely “no”: the photon is a massless particle. According to theory it has energy and momentum but no mass, and this is confirmed by experiment to within strict limits.

The value for Planck’s constant is the slope of your graph multiplied by e/c where e is the electronic charge (1.6022 x 10-19 C) and c is the velocity of light (2.998 x 108 m/s).

Planck’s constant was first discovered by Max Planck in experiments that helped lead to the formation of quantum mechanics. The value of the Planck constant is: h=6.34. J·s eV·s.

hc value

The Coulomb constant, the electric force constant, or the electrostatic constant (denoted ke, k or K) is a proportionality constant in electrostatics equations. In SI units it is equal to 8.14)×109 kg⋅m3⋅s−2⋅C−2.

c=3.0 x 108m/s (the speed of light in a vacuum) This constant “c” is how fast electromagnetic radiation (light for all extensive purposes) travels. The other is “h”, which called Planck’s constant. h=6.626 x 10-34 J s.