Physics Ii May 2004

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B.1i:. (Second S""est,,) EXAMINATION, May, 2004 PHYSICS -II (PlIY -102 _ D)

rune: Three HoulY 1

[ Maxi/nunz Marks: 100

N ••• 'Atte •• ", ji"" qu","o", ;" .u '<1ectiug " leos, 4vo questions from each Part.

Part-A

Due."

1. of Betatron. time "'Jfug _c held. n"'''ibe coo","cti •• and theory

The •• • •• etic flux wbich. "able "'bit;" • bet",oo cb __ " of 15 WW. Wouid be the eo",,, of ••• electron which """e'!rOes 10' 'e'olutioo ? 5, 10, 5

CO"""'" "'e 2.

"'b"

1);,_ the ch" •••• of. -de •• c, io • 'i«uit cootaioiog inductance and resistance.

The _d_, of ••• "'
_I""", •• • coutai,,,. "'beo the -tainec ;, "'coated,

tbe "equcocy of the ",,"cuit " 10;) 1( 'Yde, .ud wheo it ;, filJed ";'h CO, the freoccocy c,,"- hy 50 cycle, C.kui"e the diel'
.,h, .. , 'h" W

Solving M_o}l', cqo,,;ou ;" "ec 'pi" '" E.>c'" fl"", with Ihe "'od~. of light ill'd (i;) if oud H

P. T. o.

[2

J

and the direction of propagation form a set of orthogonal vectors. 6, 7, 7 4.

Derive Schroedinger wave equation. What is the physical significance of l/J in this equation ? An electron has a speed 1·05 X 104 meters/see within the accuracy of 0·01 %. Calculate the uncertainty in the position of the electron. Part-B

5.

What do you understand by Miller indices of a crystal plane? Show that the spacing between consecutive planes dermed by Miller indices (hid) is given by :

2 2] - 1/2 b c , [ where a, b and c are primitives along three mutually dhk/=

k? ~+_+1 a2 2

2

perpendicular axes. 5, 15 6.

What do you mean by intrinsic semiconductors" Obtain an expression for the intrinsic carrier concentration in an intrinsic semiconductor. Under what condition will fenni level be in the middle of the forbidden gap ? 20

7.

Discuss Einstein's model of the lattice specific heat of solids.

8.

20

Write notes on the following : (a) Hall effect

7

(b) Ewald construction (c) Supcrconducti •• ity

6 7

320/2004

800