Download SGBAU B-Tech 1st Sem Chemical Engineering Applied Physics Question Paper

Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 1st Sem Chemical Engineering Applied Physics Previous Question Paper

33% BE. / B.Tech.(Chemical Engineering) / B.?l?cxt. First Semester (Old Course)
Applied Physics-I : l S 2
1?. Pages : 2 AW - 3533
?mym?lsma W Max. Marks : 40
Time : Two Hours
Notes : 1 Due credit will be given to ncatncss and adequate dimensions.
2 Assume suitable data wherever necessary.
3. Diagrams and chemical equations should be given wherever necessary.
4
Use of pen Blue/Black ink/re?ll only for writing the answer book.
List oi?constants:
i) Electron mass m = 9.1 x 10?3' kg
ii) Electron charge 0 = 1.6 x 10"" C.
iii) Velocity of light (2 = 3 x 108 m/s
iv) Planck's constant h 7? 6.63 x 10341.5.
1. a) Derive an Expression for conductivity in intrinsic semiconductor. 4
b) Explain the classi?cation of conductor. semiconductor and insulator on the basis of 4
conduction band. valence band and energy band gap.
c) What is LED? Explain why LED emits light. 4 3
d) LED emits yellow light of wavelength 5880A?. Calculate the energy band gap for the 3
material.
OR
2. :1.) Explain the working of Transistor in CC mode with suitable diagram. 4
b) De?ne : 3
i) Depletion Layer.
ii) Photo diode.
iii)_ LDR.
c) Explain the fonnation ofcnergy bands in solid with help of band theory of solid. 4
d) Calculate the mobility of electron in copper, if electrons per unit volume is 8.496 x 1022 3
cm3 and resistivity of copper is l.7 x 10? ohm-cm.
3. a) What is packing fraction? Calculate the packing fraction in HCC and FCC structure. 4
b) What is Bravais lattices? Writc in tabular form. 4
c) De?ne liquid crystal. State any four applications of liquid crystal. 3
d) KC] crystal which has F CC lattice stmcture has a density of 1980 kg/m3. If its molecular 2
weight is 74.55 amu. Find it?s lattice constant.
OR
AW ?- 3533 1 P.T.O

a)
b)
C)
a)
b)
C)
What are Miller indices?? Explain the procedure for ?nding Miller indices of a plane.
W hat Ls coordination number .? Shuw that the coordination number for B(IC and F C C
structure is 8 and 12 rcpt
Explain Schottky defect and I7?renkcl (Heel with suitable diagram.
Distinguish between crj. stallmc solid 417d amomhous solid.
Descrioe Davission ? (icrmcrs experiment of electron diffraction. Discuss how it explain
the wave nature ofclectron.
Show that Dc-Broglie wavclcngth of a panicle of rest mass m0 and kinetic energy K
which 3 not negligible compared with moc2 is given by.
l: ___ hc
?l?(K + 2 mug.)
Show that electron does not present inside the nucleus using Hciscnberg's uncertainty
principi c.
()R
Derive Planck's law ofblack body radiation.
The uncertainty in position of electron is 5x10?1um. Find the uncertainty in it's
11101116111 UH].
State and Explain Einstein's photoelectric equation.
*9??ii*k******
'AW - 3533 2