Institute of Science and Technology
Bachelor Level / first-semester / Science
Computer Science and Information Technology( PHY113 )
Full Marks: 60 + 20 + 20
Pass Marks: 24 + 8 + 8
Time: 3 Hours
Candidates are required to give their answers in their own words as far as practicable.
The figures in the margin indicate full marks.
Attempt any TWO questions
Design electrical conductivity of semiconductors. Derive expression for conductivity in terms of impurity ionization energy. Give a plot to discuss “Theoretical temperature dependence of the electrical conductivity of an impurity semiconductor”.
Describe processes involved in the fabrication of integrated circuits include epitaxial growth, oxidation, oxide removal and pattern definition, doping (impurities in the Si), and interconnection of components.
Find expression for force on a current-carrying wire in a magnetic field to find the force experienced by a single charge.
Attempts any EIGHT Questions
Give spectrum of Hydrogen atom and discuss its lines.
Describe a brief account of Kronig-Penny model.
Describe the term “space quantization”.
A given spring stretches 0.1m when a force of 20N pulls on it. A 2-kg block attached to it on a frictionless surface is pulled to the right 0.2m and released.
A proton is moving with a velocity v = (3 x 105 i + 7 x 105 k) m/sec in a region where there is a magnetic field B = 0.4j T. Find the force experienced by the proton.
A neutron spectroscopy a beam of mono energetic neutrons is obtained by reflecting reactor neutrons from a beryllium crystal. If separation between the atomic planes of the beryllium crystal is 0.732 A°, what is the angle between the incident neutron beam and the atomic planes that will yield a monochromatic beam of neutrons of wavelength 0.1 A°.
The density of aluminum is 2.70 g/cm3 and its molecular weight is 26.98 g/mole.
Analyze the circuit in the figure below. Determine the logic function performed by the circuit by making and justifying the appropriate truth table