Discuss magnetic dipole moment. What is its effect on atom and on molecules? Explain.[5]
2.
Two large parallel plates are separated by a distance of 5 cm. The plates have equal but opposite charges that create an electric field in the region between the plates. An α particles (q = 3.2×10−27 kg) is released from the positively charged plate, and strikes the negatively charged plate 2×10−6 sec. later. Assuming that the electric field between the plates is uniform and perpendicular to the plates, what is the strength of the electric field?[5]
Methods of Quantum Mechanics
1.
Describe Frank-Hertz experiment. Interpret how the results of this experiment advocate atomic model proposed by Bohr?[10]
2.
In neutron spectroscopy a beam of monoenergetic neutrons is obtained by reflecting reactor neutrons from a beryllium crystal. If the 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 of wavelength 0.1 A∘?[5]
3.
What is the probability of finding a particle in a well of width a at a position 4a from the wall if n=1, if n=2, if n=3. Use the normalized wavefunction ψ(x,t)=(a2)21sin(anπx)e−ℏiEt.
Array
[5]
Rotational Dynamics and Oscillatory Motion
1.
Set up differential equation for an oscillation of a spring using Hooke's and Newton's second law. Find the general solution of this equation and hence the expressions for period, velocity and acceleration of oscillation.[10]
2.
A roulette wheel with moment of inertia I=0.5kgm2 rotating initially at 2 rev/sec coasts to a stop from the constant friction torque of bearing. If the torque is 0.4 Nm, how long does it take to stop?[5]
Semiconductor and Semiconductor devices
1.
Describe the following process of IC production: (a) Oxidation, (b) Pattern definition, and (c) Doping[5]
2.
Explain the construction and bipolar junction transistor (BJT).[5]
3.
The energy gap in silicon is 1.1 eV, whereas in diamond it is 6eV. What conclusion can you draw about the transparency of the two materials to visible light (4000A∘to7000A∘)?[5]
Universal Gates and Physics of Integrated Circuits
1.
Explain RTL and TTL gates. How memory and clock circuits can be made by using these gates? Explain how they work?[10]
2.
Find the truth table for the circuit shown in the figure. What logic function will the circuit perform if the constant +5 V input to the first two gates is changed to ground potential?[5]