Momentum is conserved before and after this collision. Energy is conserved before and after this collision. Since wavelength is inversely related to frequency, the wave has a lower frequency after the collision. This leaves the photon having a lower frequency after the collision. After the collision, some energy has been transferred to the electron. When a photon strikes an electron, the p. □ ′ −□= □ □ □ □ (□− □□□ □) Compton effect □ ′ −□= □ □ □−□□□□ where □ □ = ℎ □ 0 □ Compton wavelength □ ′ −□= □ □ ′ − = □ □ ′ − □ □ = ′ − □ □ Compton shift For an electron C = pm = x m c = 3.0 x 108 m/s m0= 9.11 x kgħ Key points The frequency and consequently the energy of the photon is higher before the collision. This physics video tutorial provides a basic introduction into the compton effect also known as compton scattering. Basically, PE effects result only in an ionized electron, but Compton scattering results in an. The change in wavelength (Compton shift) expected for a photon scattered through the angle by a particle of rest mass m0 is independent of the wavelength of the incident photon. The electron is knocked out of the atom, but a scattered photon also comes out of the atom. When an x-ray photon collides with a stationary target. Gain in electron energy = loss in photon energy K = Eincident photon – Escattered photon = hf – Escattered photon = hf – hf’ = ℎ□− ℎ□ ′ = Eincident photon – hf’ = □ □□□□□□□□ □ℎ□□□□ − ℎ□ ′ = ℎ□ − □ scattered photon = ℎ□ − ℎ□′ = ℎ□ − ℎ□ ′ where: f = frequency of incident photon f’ = frequency of scattered photon = wavelength of incident photon ’ = wavelength of scattered photonĥ The kinetic energy of the scattered electron can also be calculated using the following equation:Ħ For an electron C = 2.426 pm = 2.426 x 10-12 m Compton Effect Arthur Holly Compton observed that x-rays increase in wavelength when scattered. When an x-ray photon collides with a stationary target electron, the photon is scattered away from its original direction of motion while the electron receives an impulse and begins to move with kinetic energy K.Ĥ The energy lost by the photon equals the kinetic energy K gained by the electron. Physics and Math Librarian Alison Verbeck organized this exhibition in collaboration with members of the Physics faculty and University Archivist Sonya Rooney in honor of the 100th anniversary of the Compton Effect.Discuss Compton effect and calculate Compton shift by solving problems.Ģ Compton Effect Arthur Holly Compton observed that x-rays increase in wavelength when scattered. This exhibition celebrates Compton and the 100th anniversary of the Compton Effect. He served as chancellor of Washington University in St. Compton is known for leadership over the Metallurgical Laboratory at the University of Chicago during the Manhattan Project. As demonstrated by Compton, this proof that light cannot be explained purely as a wave phenomenon is known as the Compton Effect.Ĭompton’s discovery stimulated the development of quantum mechanics and earned him the Nobel Prize in 1927 for his research. This research provided the first proof that x-rays – formerly thought to be waves – could also behave as particles, confirming a long-standing, but largely ignored prediction by Albert Einstein. The idea that light had both wave and particle properties was not readily accepted at the time.Ĭompton, through his research, explained that each ray behaved as a particle, conserving energy and momentum in collisions with electrons. Kranzberg Art & Architecture Library Special CollectionsĪrthur Holly Compton (Septem– March 15, 1962) was an American physicist who conducted groundbreaking research in Eads Hall here at Washington University in the 1920s.Īs head of the Department of Physics in 1922, Compton conducted x-ray scattering experiments demonstrating electromagnetic radiation’s particle nature.Scholarly Communication & Digital Publishing Services. Kenneth and Nancy Kranzberg Art & Architecture Library.Special Collections Research Guidelines.Special Collections Collection Development Policy.
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