April 2006(For ECE, CSE and EEE)

Sree Narayana Guru College of Engineering and Technology, Payyanur
Second series test - April 2006

ENGINEERING PHYSICS
(For ECE, CSE and EEE)

Time: 2Hours Marks: 50

Part A: Answer all questions

1 Mention the properties of ultrasonics.
2 Explain the phenomenon of Zener breakdown
3 Distinguish between conductors, semiconductors and insulators on the basis of Fermi energy level
4 Write a brief note on solar cell
5 Explain Josephson effect
(5x4=20 Marks)

Part B: Answer three questions

6.Explain a wavefunction and derive time dependent Schrödinger wave equation for a free particle. (10 Marks)

OR

7.Explain a wavefunction and setup the equation for time independent Schrödinger wave equation. (10 Marks)


8 (a) Mention the applications of ultrasonics (4 Marks)
(b) Explain the basic principle of electron spin resonance (6 Marks)

OR

9 (a) Calculate the zero point energy for an electron in a box of width 4Å (4 Marks)
(b) Explain the basic principle of nuclear magnetic resonance (6 Marks)


10 With theory explain how Hall voltage and Hall coefficient are measured? (10 Marks)

OR

11 (a) The Hall coefficient of a specimen of a doped Silicon is found to be 3.66´10-4 m3/C. The resistivity of the specimen is 8.93´10-3Wm. Find the mobility and the density of the charge carrier. (5 Marks)
(b)What is Hall effect? Explain the importance and applications of Hall effect. (5 Marks)