![]() ![]() The Compton scattering has on occasion been proposed as an alternative explanation for the phenomenon of the Redshift by opponents of the Big Bang theory, although this is not generally accepted because the influence of the Compton scattering would be noticeable in the spectral lines of distant objects and this is not observed.Ĭompton used a combination of three fundamental formulas representing the various aspects of classical and modern physics, combining them to describe the quantum behaviour of light. 21.1 Compton scattering of a photon off a charged particle. This is the effect caused by the weakly bound electrons that are ejected from the surface of the material when electromagnetic radiation interacts with the electrons. In 1922, Compton applied the laws of conservation of energy and momentum to a collision between a photon and a free electron to obtain an expression for the change in wavelength as a function of the scattering angle, \(\theta\), the photon Fig. It is also of prime importance to the radiobiology, as it happens by is the most probable interaction of X rays with atomic nuclei in living beings and is applied in radiation therapy. Compton effect: Photoelectric effect: This is the effect caused by the inelastic scattering of high-energy photons that are bound to free electrons. Light must behave as if it consists of particles in order to explain the Compton scattering. ![]() ![]() Thomson scattering, the classical theory of charged particles scattered by an electromagnetic wave, cannot explain any shift in wavelength. The effect is important in scientific terms because it demonstrates that light cannot be explained purely as a wave phenomenon. In other materials, it is only observed only with high-energy photons photons of visible light, for example, do not have sufficient energy to eject the bound electrons. In a material where there are free electrons, this effect will occur at all photon energies and hence all wavelengths. This scattering is known as Compton Scattering. Thus overall there is a slight 'reddening' and scattering of the photons as they pass through the material. (If the photon still has enough energy, the process may be repeated.) Because of the overall reduction in energy of the photon, there is a corresponding increase in its wavelength. Compton's experiment became the ultimate observation that convinced all physicists that light can behave as a stream of particles whose energy is proportional to the frequency.īecause the photons have such high energy, the interaction results in the electron being given enough energy to be completely ejected from its atom, and a photon containing the remaining energy being emitted in a different direction from the original, so that the overall momentum of the system is conserved. In quantum mechanics, the Compton scattering or Compton effect, observed by Arthur Compton in 1923, is the increase in wavelength which occurs when X-ray (or gamma ray) photons with energies of around 0.5MeV to 3.5MeV interact with electrons in a material. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |