CHEM101 Lecture Notes - Lecture 4: Photon, Atomic Nucleus, Black-Body Radiation

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Yoram Apelblat

Document Summary

Einstein: matter and energy are alternate forms of the same entity. All matter exhibits properties of both particles and waves. Electrons have wave-like motion and therefore have only certain allowable frequencies and energies. Matter behaves as though it moves in a wave, and the de broglie wavelength for any particle is given by: l = h mu m = mass u = speed in m/s. Table 7. 1 the de broglie wavelengths of several objects. Calculating the de broglie wavelength of an electron. Find the debroglie wavelength of an electron with a speed of 1. 00x106 m/s (electron mass = 9. 11x10-31 kg; h = 6. 626x10-34 kg(cid:121)m2/s). Diffraction patterns of aluminum with x-rays and electrons. Electron microscope x-ray diffraction of aluminum foil electron diffraction of aluminum foil. Major observations and theories leading from classical theory to quantum theory. Since matter is discontinuous and particulate, perhaps energy is discontinuous and particulate. Planck: energy is quantized; only certain values allowed.