Gujarat Technological University 2009-2nd Sem B.E Computer Engineering [All Branch] Subject code: 110011 Subject Name: Physics - Question Paper
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E. Sem-II [All Branch] exam June 2009
Subject code: 110011
Subject Name: Physics
Date: 08/06/2009
Total Marks: 70
Seat No. Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E. Sem-II [All Branch] examination June 2009 Subject code: 110011 Subject Name: Physics
Date: 08/06/2009 Time: 10:30am-1:00pm
Instructions: Total Marks: 70
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) List and explain the characteristics of musical sound. 03
(d) How properties of semi conducting materials are differed From 03 conducting materials?
(e) List the application of the LASER. 02 Q.2 (a) Explain the arrangement of determine the velocity of ultrasonic 07
Waves using required figures. Also explain the application of the ultrasonic.
(b) Explain & derived the relation between the inter planar distance and 07 cube edge.
(b) What is Einstein coefficient? Derived the relation between the 07 Einstein coefficient. Also give the difference between stimulated Emission.
Q.3 (a) A rectangular semiconductor specimen of thickness 1 mm place the 05 magnetic field of flux density 0.5 Wb/m2. Current of 1.5 mA is flowing through specimen in one direction. Calculate resulting hall voltage. Here Hall coefficient of the material is 1 x10-2 M3/C.
(b)
(c)
Q.3 (a)
Explain the classical free electron theory of metal. 05
Give the comparison of classI and classll super conductors. 04
Calculate the energy gap in Ge when it is transparent to radiation of 05 wavelength of 12000A [h=6.625x 10-34 J C=3x108 m/s].
(b)
(c)
(a)
Give the application of the super conductor. 04
Give the understanding of Thermal conductivity. 05
Q.4
Calculate the electrical conductivity of copper. Given atomic weight, 05 density and relaxation time as 63.5, 8.9*103 Kgm-3 and 2.48*10-14 S respectively.
(b) (c)
(a)
(b)
(c)
(a)
(b) (c)
Q.5 (a)
(b)
(c)
Give the difference between simple, zener, and varactor diode. 05
Explain the hall effect. 04
Q.4
