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B.TECH PAPERS
PHYSICS
(B.Tech 1st & 2nd Semester,2063)
(PHY-101)( June -2003)
Maximum Marks : 60
Section-A
1(a) What do you understand by curl of a vector?
(b) Explain electromotive force.
(c) Why population inversion is essential for stimulated emission?
(d) An infinite charge sheet has a surface charge density (σ) of 1 x 10-7
coulomb/m2. How far apart are
the equipotential surfaces whose potential differ by
5.0 volts ?
(e) What is numerical aperture?
(f) What are Einstein's postulates of relativity?
(g) What is Raman effect and its importance?
(h) Differentiate between Group and Phase
Section-B
2. (a) Define electric potential and field at a point. Explain how we may
calculate the electric field from the electric
potential and vice versa.
(b) What is dielectric polarization and electric
displacement?
3. (a) What is Biot-Savart Law? Find the intensity of magnetic field at a point
on the axis of a circular ciol carrying current.
(b) Give Maxwell's equations.
4. (a) Explain the terms:
(i) Life time of an energy state
(ii) Meta stable states
(iii) Optical pumping and
(iv) Population inversion
5. (a) Differentiate between step index and graded index fibre. Explain index
material dispersion in pulse dispersion in
optical fibers.
(b) Give some applications of optical fibres.
Section-C
6. (a) Discuss in detail the Michelson-Morley Experiment.
(b) What is the total energy E of a 2.50 MeV electron?
(mass of electron = 9.109 x 10-31 kg).
7. (a) Differentiate between continuous and characteristics X-ray spectra. What
is Brag's law? Give its derivation.
(b) What is Mosley's law and its importance?
8. (a) Write the Schrodinger wave equation for the particle in a box and solve
it to obtain the Eigen values and Eigen
functions.
Explain briefly Uncertainty
Principle.
9. What do you understand by Type I and Type II superconductors? Give the BCS
theory of Superconductivity.