CHY 103 Lecture Notes - Lecture 7: Bohr Model, Quantum Mechanics, Electron Shell
6 Jun 2019
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Document Summary
Chapter 7: the quantum-mechanical model of the atom. Quantization of light and emission spectra of hydrogen leads to bohr model of atom, where the electron orbits the nucleus. Bohr model based on idea that energy levels of atoms are quantized, i. e. , electrons in atoms have certain allowable energy levels (called orbits) where they can reside. Movement of an electron from one orbital to another requires the absorption or emission of quantized energy. In the last lecture we discussed how light can be characterized in terms of both particles and waves. Louis de broglie provided us with the answer. With the regards to the atom, de broglie concluded that an electron orbiting a nucleus could be thought of as a wave possessing a characteristic wavelength. Calculate the wavelengths of the following objects. (a) a baseball weighing 142 g thrown at 142 km/h. (b) a helium atom moving at a speed of 8. 5 x 105 m/s.
