Punjab Technical University 2009-1st Sem B.Tech B Tech ester, , Physics , Regular , - Question Paper

Time: three Hours
Maximum Marks: 60

Instruction to Candidates:
1) Section- A is Compulsory.
2) Attempt any 5 ques. from Section- B & C
3) choose at lowest 2 ques. from part - B & C

part – A [Marks 2*10=20]

Q1)a) discuss the term length contraction?

b) What is the wavelength of CO Laser and Ruby Laser?

c) discuss E.M.F Electric Field.

d) describe Acceptance Angle.

e) describe the process of doping in semiconductors.

f) Write down the relation of critical field with critical temperature in superconductors.

g) describe population inversion in LASERS.

h) Differentiate ranging from inertial and non inertial frames of reference.

i) Plot the graphs for type-I and type-Il superconductors.

j) describe Eigen values and Eigen functions.

part – B [Marks: eight Each]

Q2) Derive the relations for Maxwells equations.

Q3) (a) compute the expression for N.A. for OFCs.

(b) A step index fiber has a normalized frequency 26.6 at 1300nmw. If core is 50 pm thick compute the acceptance angle of the fiber.

Q4) (a) discuss the working construction and energy level diagram for He Ne laser.

(b) discuss the term spiking in Ruby laser.

Q5) discuss elaborate Ferrites? Mention a few applications of Ferrite materials.

part – C [Marks: eight Each]

Q6) (a) Derive the expression for Lorentzs Transformation equations.

(b) Prove that velocity of light is independent from the velocity of frame of reference.

Q7) (a) Differentiate ranging from Continuous and Characteristic -Rays.

(b) describe Wave Function and compute the expression for Time Independent Schrodinger Wave formula.

Q8) discuss Compton Effect and compute the expression for Compton Shift.

Q9) Derive & discuss the London equations and compute the expression for penetration depth.

Earning:   Approval pending.