Gujarat University 2005 B.Sc Physics -II OLD - Question Paper

PHYSICS-II OLD COURSE



Instructions : (1) All ques. carry equal marks.
(2) Symbols have their usual meanings.
(3) Figures to the right indicate marks.


1. (a) Explain Miller indices. 4
(b) Obtain Bragg’s legal regulations for diffraction of X-rays by crystal. 6
(c) Explain with figure various kinds of lattice for a cubic system in three
dimensions. 4
OR
1. (a) Explain avg. life time and find ? = 1 6
?

(b) (c) What is artificial radioactivity ? define Rutherford’s experiment.

obtain out the radioactive decay constant of Ra226 whose half life time is four days. 5

3

2.
(a)
find an expression for the growth of charge when R and C are connected to
d.c. source to form a series circuit. 6
(b) Explain the method to obtain capacitance using Schering bridge. 6
(c) Define Time constant and write its unit. 2
OR

2. (a) Explain working procedure of half wave rectifier and find formula for Idc, Vdc
and Irms. 5
(b) Draw the circuit diagram of bridge rectifier and discuss its working. Write
advantages and disadvantages of it. 5
(c) State and discuss Norton’s theorem. 4



3. (a) Derive integral form of Gauss’s legal regulations and hence derive its differential form. 7

(b) Give definition of capacitor and farad. find the expression for the stored in a charged capacitor.

OR energy

7
3. (a) Obtain Clausius-Mossotti formula for non-polar liquids and solids. 6
(b) Show that the surface density of polarisation charges in the substance is

?p = ?p , ?e

n. 4


?
4 (c) Obtain the relation ranging from electric field ( E ) and electric potential (?).


4.

(a)

provide the theory of Newton’s ring and find the expression for the path, path-







r2
difference = R +

?
2 . Write the condition for constructive and destructive

interference. 6 (b) Describe principle of construction and working of a Michelson interferometer. 5 (c) Find out the ratio of radii of third bright and dark Newton’s ring. 3
OR

4. (a) What is interference ? The waves emitting from 2 point sources are incident on the screen at a point P. find the expression for intensity.

6
(b) Obtain the expression for the equivalent focal length of 2 lens system. 4
(c) Draw figure to show the principal focii and the principal points of a thick lens. 4


5.

(a)

What is Compton effect ? find the expression for the frequency of scattered
radiation in Compton effect. 6

k b
(b) Describe Sommerfield model in short and derive the expression n = a 8

OR

5. (a) Obtain 1 dimensional Schrodinger formula for a free particle. 7
(b) Calculate Normalization Constant (A) for a provided wave function. 3
(c) Explain de-Broglie’s hypothesis. 4

Earning:   Approval pending.