Discuss magnetic dipole moment. What is its effect on atom and on molecules? Explain. [5]

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 $\alpha$ particles (q = $3.2\times10^{-27}$ kg) is released from the positively charged plate, and strikes the negatively charged plate $2\times10^{-6}$ 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]

Describe Frank-Hertz experiment. Interpret how the results of this experiment advocate atomic model proposed by Bohr? [10]

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 $A^{\circ}$, 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 $A^{\circ}$? [5]

What is the probability of finding a particle in a well of width $a$ at a position $\frac{a}{4}$ from the wall if $n = 1$, if $n = 2$, if $n = 3$. Use the normalized wavefunction $\psi(x,t) = \left(\frac{2}{a}\right)^{\frac{1}{2}} \sin\left(\frac{n\pi x}{a}\right) e^{-\frac{iEt}{\hbar}}$. [5]

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]

A roulette wheel with moment of inertia $I = 0.5\ \mathrm{kgm^2}$ 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]

Describe the following process of IC production: (a) Oxidation, (b) Pattern definition, and (c) Doping [5]

Explain the construction and bipolar junction transistor (BJT). [5]

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 ($4000 A^{\circ} to 7000 A^{\circ}$)? [5]

Explain RTL and TTL gates. How memory and clock circuits can be made by using these gates? Explain how they work? [10]

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]