GTU 3110018 Physics Winter 2025 Question Paper & PDF

Explain how the materials are classified into conductors, semiconductors and insulators with the help of energy band diagrams.

Explain in detail how Kroning and Penney model explains the origin of band gap in semiconductors.

Define Following Terms

Define carrier transport and explore how charge carriers move within semiconductor materials, emphasizing the mechanisms of drift and diffusion.

Describe how to formulate the density of holes in the valence band for intrinsic semiconductors.

Determine the band gap of the material when the light source composed of it emits radiation with a wavelength of 8628 Å.

Interpret the process of deriving the Fermi level expression for n-Type semiconductors, and subsequently, utilize this expression to compute the electron density in the conduction band.

A Silicon plate of thickness 1mm, breadth 10 mm and length 100 mm is placed in a magnetic field of 0.5 Wb/m² acting along its thickness. If 0.01 A current flows along its length, calculate the Hall coefficient if developed Hall voltage is 1.83 mV.

Discuss in detail Four probe method used for resistivity measurements in thin sheet.

Define density of states and obtain expression for the density of states in terms of mass of electron(m), Planck’s constant (h) and Energy (E).

The Fermi level in given material is 2.8 eV. What are the energies for which the probabilities of occupancy at 270K are 0.89,0.20, 0.02 and 0.5