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See all →- Semiconductor Physics Notes FE Sem 1 Applied Physics | MU MU FE Sem 1 Applied Physics Module 6: direct and indirect band gap, drift velocity, mobility, conductivity, Fermi-Dirac function, Fermi leve...
- Lasers Notes FE Sem 1 Applied Physics | Mumbai University MU FE Sem 1 Applied Physics Module 1 Lasers: stimulated emission, population inversion, He-Ne and fibre laser, LiDAR, barcode reader, solved...
- Fibre Optics Notes FE Sem 1 Applied Physics | Mumbai University MU FE Sem 1 Applied Physics Module 2 Fibre Optics: acceptance angle, numerical aperture, fibre types, attenuation, communication system, sol...
- Thin Film Interference Notes FE Sem 1 Applied Physics | MU MU FE Sem 1 Applied Physics Module 3: thin film interference, maxima and minima, wedge film, Newton's rings, anti-reflection coating, solved...
- Electrodynamics Notes FE Sem 1 Applied Physics | MU MU FE Sem 1 Applied Physics Module 4: gradient, divergence, curl, Gauss, Ampere and Faraday laws, divergence and Stokes theorems, Maxwell's...
- Quantum Physics Notes FE Sem 1 Applied Physics | MU MU FE Sem 1 Applied Physics Module 5: de Broglie waves, wave function, Schrödinger equations, particle in a box, tunnelling, qubits, solved...
Top questions
See all →- What is the difference between direct band gap and indirect band gap semiconductors? In one line In a direct band gap semiconductor the conduction band minimum and valence band maximum occur at the same crystal momentum k , s... 1
- How is the electrical conductivity of an intrinsic and extrinsic semiconductor expressed? In one line The conductivity of a semiconductor is σ = e(nμ_e + pμ_h) , the sum of contributions from electrons and holes; for intrinsic mat... 1
- What is drift velocity of charge carriers and how is it related to current? In one line Drift velocity is the small average velocity that free electrons (or holes) acquire in the direction set by an applied electric... 1
- What is mobility of charge carriers and what factors affect it? In one line Mobility is the drift velocity acquired by a charge carrier per unit electric field, μ = v_d/E , and it measures how easily carr... 1
- How is the electrical conductivity of a metallic conductor derived in terms of drift velocity and mobility? In one line In a metal the current density is J = nev_d = neμ E , so conductivity is σ = neμ = ne²τ/m , set by the free-electron density and... 1
- What is the Fermi-Dirac distribution function and how does it behave at different temperatures? In one line The Fermi-Dirac distribution function f(E) = 1/(1 + e^((E - E_F)/kT)) gives the probability that an electron energy state E is o... 1