Photoelectric Effect. Einstein's Photon Theory (光电效应、爱因斯坦光子理论 equipment Einstein assumed that the 光电管 A energy in a light beam travels K through space in concentrated is bundles, called photons. The energy e of a single photon is given by E=h Applying the photon r concept to the photoelectric E efifect. Einstein wrote K hV== nmy+A0…(10
equipment 2. Photoelectric Effect. Einstein’s Photon Theory (光电效应、爱因斯坦光子理论) R K1 K2 E G V les, called photons. Einstein assumed that the energy in a light beam travels through space in concentrated bund p i The energy E of a single photon is given by E = hv . Applying the photon concept to the photoelectric effect, Einstein wrote S I S i 光电管 K A (10) 2 1 0 2 h = mvmax + A
Equation above says that a photon carries an energy hy into the sur- electron face. Part of this energy Ao is used o hy in causing the electron to pass 金 through the metal surface. The 属A excess energy(hv-Ao) is given to the electron in the form of kinetic energv In 1916, Millikan, experiments verified einstein's ideas in eve ry detail Einstein succeed in explaining Fl the photoelectric effect. 图7-5密立根光电效应实验装置图
Equation above says that a photon carries an energy hv into the surface. Part of this energy A0 is used in causing the electron to pass through the metal surface. The excess energy (hv-A0 ) is given to the electron in the form of kinetic energy. In 1916, Milikan, experiments verified Einstein’s ideas in every detail. Einstein succeed in explaining the photoelectric effect. h - - 金 属 electron - - - A v
The dual nature of light, particle and wave 光的波粒二象性 particle wave (energy E ( frequency h (momentum) Po a (wavelength) These two natures are connected by h Eb=h…(1) E-E+(PC hv h P=E/C (2)
The dual nature of light, particle and wave 光的波粒二象性 particle wave （energy） （frequency） （momentum） （wavelength） E P h These two natures are connected by h. (1) E = h / (2) h C h P = E C = = 2 2 0 2 E = E + (P c)
3. The Compton effect(康普顿效应 Compelling confirmation of the concept of the photon as a concen trated bundle of energy was provided in 1923 by A.H. compton who earned a Noble prize for this work in 192/7 Mrn Compton allowed a beam of X-rays of sharply defined wavelengthito fall on a graphite block. He measured for various angles of scattering, the intensity of the scattered X-rays as a function of their wavelength
3. The Compton effect (康普顿效应) Compelling confirmation of the concept of the photon as a concentrated bundle of energy was provided in 1923 by A.H.Compton who earned a Noble prize for this work in 1927. Compton allowed a beam of X-rays of sharply defined wavelengthλto fall on a graphite block. He measured, for various angles of scattering, the intensity of the scattered X-rays as a function of their wavelength
1) Equipment 10.70A X射线分析仪 光石墨 X光栏 Compton allowed a beam of X-rays of sharpl defined wavelengthito fall on a graphite block. He measured, for various angles of scattering, the intensity of the scattered X-rays as a function of their wavelength
1) Equipment Compton allowed a beam of X-rays of sharply defined wavelengthλto fall on a graphite block. He measured, for various angles of scattering, the intensity of the scattered X-rays as a function of their wavelength.0 X光 光 栏 石墨 0.70Å X射线分析仪