Electrical Engineering Material Part-II
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This presentation deals with the fundamentals of Electrical Engineering Materials & it contains Bohr Postulate, wave & Particle Duality, Quantum number, Electron energy level transitions
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This would enable students to explain the emission spectrum of hydrogen using the Bohr model of the hydrogen atom; calculate the energy, wavelength, and frequencies involved in the electron transitions in the hydrogen atom; relate the emission spectra to common occurrences like fireworks and neon lights; and describe the Bohr model of the atom and the inadequacies of the Bohr model.
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1. It defines wavelength and frequency of electromagnetic radiation and describes the relationship between them.
2. It discusses Max Planck's realization that energy is quantized and light has particle characteristics based on his study of blackbody radiation.
3. It explains Bohr's model of the hydrogen atom which incorporated Planck's quantum theory and correctly explained hydrogen's emission spectrum using discrete energy levels. However, the model failed for other elements.
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Electrical Engineering Material Part-II
- 1. ELECTRICAL ENGINEERING MATERIALS MR. ASIF L. JAMADAR
- 2. BOHR POSTULATE Absorb or emit the frequencies of electromagnetic radiation by the atom Neils Bohr’s conclusion over discrete frequency absorbed or emitted by atom Bohr postulate: An electron did not radiate energy if it stayed in one orbit When the electrons moved from one orbit to another, it either radiated or absorbed energy. For an electron to remain in its orbit, the electrostatic attraction between the electron and nucleus …….. 2
- 3. WAVE / PARTICLE DUALITY Both wave & particles have a dual nature. An electron speeding down the column of an electron, in microscope as electron produces such wave like diffraction effects upon interaction with the materials. Wave/particle duality is expressed by λ = h / p = h / mv Plank’s Constant (h = 6.62 X 10-34 J-s) 3
- 4. QUANTUM NUMBER Modern atomic theory indicates that the position and momentum of electrons State of an electron in an atom can be described by four quantum numbers. Principle quantum number, n Orbital quantum number, l Magnetic quantum number, ml Spin quantum number, ms 4
- 5. ELECTRON ENERGY LEVEL TRANSITIONS Set of electrons Energies of electrons depends on quantum number Electron transitions between two levels Excitation De-excitation E2 - E1 = ∆E = hv12 = hc / λ As computational aid, ∆E (eV) = 1.24 / λ (μm) 5
- 6. THANK YOU 6