For a given intrinsic semiconductor with energy gap Eg = 0.44 eV, calculate the position of Fermi Level at 300 K. (Where m = me* = m0 which is rest mass of an Electron).
Explain the light material interaction in terms of absorption, spontaneous emission and stimulated emission in semiconductors with proper diagrams.
Calculate
Define resistivity and explain four point probe method with diagram for the measurement of resistivity of bulk sample.
What is deep level in band theory? Describe the experimental procedure for DLTS method to study deep levels.
A sample of pure Si at room temperature has a carrier concentration of
What is E-k diagram? Discuss direct and indirect band gap semiconductors based on E-k diagram.
At what temperature, we can expect a 10% probability that electrons in metal have an energy, which is 1% above the Fermi energy? Fermi energy if the metal is 5.67 eV.
Explain the Kronig-Penny model of solids and show that how it explains the origin of band gap in solids.
Describe the hot probe method to identify the type of semiconductor (for 03 N-type semiconductor)
Calculate the critical current for wire of metal alloy having diameter 1mm at 4.5 K. (Given Critical temperature for alloy is 9.0 K and Hc(0) = 6.5x 104 Am-1)
What is photovoltaic effect? Explain construction and working of solar cell in detail.
In the Hall probe measurement, current of 300 mA is sent through a sample having length 10mm, width 5mm and height 0.2mm. The Hall voltage observed to be 150μV, when sample was exposed with 2000 gauss field perpendicularly. Calculate carrier concentration and drift velocity of the carrier in the sample.
What is light gain? Explain the Einstein’s theory about interaction between matter and radiation in detail along with absorption and emission with necessary equation.
State any three points of differences between intrinsic and extrinsic semiconductors.
For a metal sample, Density = 16.6x103 kgm-3, Resistivity= 50 μΩ.cm and Atomic weight = 180.95, then calculate the mobility and the average collision time for metal through classical theory.
Explain Meissener’s effect in detail and show that for superconductor, χm = –1
State any three points of differences between Ohmic junction and Schottky junction.
Calculate
Discuss BCS theory of superconductivity in brief. (ii) Draw constructive diagram of SQUID and mention its application.
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Official Gujarat Technological University (GTU) examination paper and step-by-step solutions for Physics (Summer 2026, B.E. · Common Engineering, Sem 1). Features complete 70-mark regular & remedial examination pattern, official marking distribution across all 5 questions, and direct 1-click official PDF download.
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