STUPIDSID
1
A crystal plane cuts at 3a, 4b and 2c distances along the crystallographics axes. Find the Miller indices of the plane.
2 M
2
Define atomic packing fraction.
2 M
3
What is Poisson's ratio?
2 M
4
State Newton's law of cooling.
2 M
5
What is meant by degenerate state?
2 M
6
What is Compton wavelength? Give its value.
2 M
7
List four methods of detecting ultrasonic waves.
2 M
8
Calculate the intensity level of a turbine whose sound intensity is 100 Wm-2 when it is in operation. Given that the standard intensity level is 10-12 Wm-2.
2 M
9
Define numerical aperture.
2 M
10
What are the roles played by the N2 and He in CO2 Laser?
2 M
Answer any one question from Q11.(a) & Q11. (b)
11. (a) (i)
Explain the construction and working of Czochralski technique for growing crystal with its advantages.
12 M
11. (a)(ii)
The lattice constant of a cubic crystal is 2.5Å Find the lattice spacing for (310) and (213) planes in the lattice.
4 M
11. (b)
Show that in an ideal hexagonal closed packed structure the c/a ratio is 1.663 and its atomic packing factor equals to that of the face-centered cubic structure.
16 M
Answer any one question from Q12.(a) & Q12.(b)
12. (a)
What is cantilever? Derive an expression for the depression at the free end of a cantilever when the other end is rigidly fixed (Assume the weight of the cantilever is negligible).
16 M
12. (b) (i)
Derive an expression for the rectilinear flow of heat along an uniform bar (One dimensional flow of heat).
13 M
12. (b) (ii
Calculate the thickness of the slap of area 90× 10-4 m-2 through which 6 joules of heat is flowing per second through the opposite faces maintained at a temperature difference of 20 K. The coefficient of thermal conductivity of the material of the slab is 0.04 Wm-1 K-1.
3 M
Answer any one question from Q13.(a) & Q13.(b)
13. (a)
Derive an expression for Planck's radiation law and discuss the same for shorter and longer wavelengths.
16 M
13. (b) (i)
Solve Schrodinger wave equation for a particle in a box (one dimesional) and obtain the energy eigen values.
10 M
13. (b) (ii
Describe the working of Scanning Electron Microscope.
6 M
Answer any one question from Q14.(a) & Q14.(b)
14 (a) (i)
Describe in detail the production of ultrasonic waves by piezo-electric method.
10 M
14 (a) (ii)
Draw a block diagram of ultrasonic flaw detector. Describe the working of ultrasonic flaw detector for non-destructive testing by reflection mode.
6 M
14. (b)
Derive expression for growth and decay of energy density inside a hall and hence deduce Sabina's formula for the reverberation time of the hall.
16 M
Answer any one question from Q15.(a) & 15.(b)
15. (a)
Explain the construction and woking of CO2 laser with its advantages.
16 M
15. (b) (ii
What is the NA of a fibre, which has a relative refractive index different of 0.05 and a core refractive index of 1.5?
2 M
15.(b) (i)
Explain in detail how optical fibers are classified according to the material, refractive index and modes of propagation.
14 M
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