Applied Science 2 Pune University

Can you provide me some questions from previous year question paper of F. E. (Common) Applied Science-II Physics University of Pune?

[shikha]

Some questions from previous year question paper of F. E. (Common) Applied Science-II Physics University of Pune are as follows:

Q1.
a) Explain how the wave group is formed, and obtain an expression for a group
velocity.
b) Explain in short, why ψ is not directly related with probability and obtain
Schrodinger’s time dependent wave equation
c) Obtain Heisenberg’s uncertainty principle in terms of energy and time

OR

Q2.
a) Derive an expression for the energy levels and wave functions of a particle
enclosed within infinite deep potential well. Draw the probability
distribution curves.
b) State Heisenberg’s uncertainty principle and establish it with the help of
single slit diffraction experiment
c) For the particle moving with non-relativistic energy, show that the group
velocity is equal to the particle velocity.

Q3.
a) State the properties of Laser and explain construction and working of solid
state laser.
b) Explain following properties of superconductors.
1) Critical magnetic field
2) Critical current density.
c) State the advantages of optical fiber communication technology over the
conventional methods

OR

Q4.
a) What is holography? State its principle. Explain the process of holography
recording and reconstruction
b) Explain the Meissner effect. Show that superconductors are perfect
diamagnet.
c) Explain with the help of energy level diagram
1) Spontaneous emission &
2) Stimulated emission.

Q5.
a) What is Hall effect? Obtain an expression for Hall voltage and Hall
coefficient. State applications of Hall effect.
b) Explain any two properties nanoparticles.
c) Calculate the conductivity of pure silicon at room temperature when the
concentration of carriers is 1.5 × 1016/m3 and the mobilities of electrons
and holes are 0.12 and 0.05 m2/v-sec respectively at room temperature.

OR

Q6.
a) Explain principle, construction and working of solar cell. Explain its
characteristic curve
b) Explain with neat labeled diagram the synthesis of metal nanoparticles by
colloidal route.
c) A silver wire is in the form of a ribbon 0.50cm wide and 0.10 mm thick.
When a current of 2Amp passes through the ribbon perpendicular to a 0.80
Tesla magnetic field, how large a hall voltage is produced along the width?
The density of silver is 10.5 gm/cm3.
(At.wt of silver = 108)

Q7. a) Show that :
1) Phase velocity of matter wave is c2/v, where C is the speed of light and v
is the velocity of the particle.
2) Group velocity of a wave packet is equal to particle velocity.
b) Derive Schroedinger’s time independent wave equation.
c) An electron is trapped in a rigid box of width 2A°. Find its lowest energy level
and momentum.

OR

Q8. a) Derive an equation of energy and wave function when a free particle is
trapped in an infinite potential well.
b) State de Broglie’s hypothesis and derive the equation for de Broglie’s
wavelength in terms of
1) Energy
2) For an electron.
c) If uncertainty in the position of a particle is equal to de Broglie’s wavelength,
then show that uncertainty in velocity is equal to the velocity of the particle.

Q9. a) Explain the construction and working of semiconductor laser with the help of
Energy band diagram.
b) What is superconductivity ? Explain BCS theory of superconductors.
c) Explain the terms :
1) Meissner effect 2) Population Inversion

OR

Q10. a) Explain the construction and working of He-Ne Laser with neat, labelled
diagram.
b) Distinguish between Type I and Type II superconductors.
c) What are the advantages of Fibre Optic Communication ?

Q11. a) Explain Hall Effect in semiconductors. Derive equation for Hall voltage and
Hall coefficient.
b) Explain any two properties of nanoparticles.
c) Calculate the number of acceptors to be added to a Germanium sample to
obtain the resistivity of 10Ω -cm.
Given : μ = 1700 cm2/volt.sec.

OR

Q12. a) Define Fermi level in conductors and semiconductors. Show that the Fermi
level lies at the centre of Energy gap in an intrinsic semiconductor.
b) Explain synthesis of metal nanoparticles by colloidal route.
c) The resistivity of copper wire of diameter 1.03 mm is 6.51 ohm per 300m.
The concentration of free electrons in copper is 8.4 ×1028/m3. If current is 2A,
find the mobility of free electrons.