III B.Sc. : Physics Paper VI Semester-V Modern Physics Model Paper 2017


III B.Sc. : Physics Paper VI 

Semester-V Modern Physics Model Paper 2017

SECTION – A

I.
Answer any FIVE of the following questions:
5 x 5 = 25 M

1.
Explain L–S coupling and J–J coupling.

2.
Explain Raman Effect and symmetry of Raman lines on the  basis of quantum theory.

3.
Explain liquid drop model.

4.
Explain miller–indices.

5.
Explain Basic Postulates of Quantum Mechanics.

6.
Calculate the de–Broglie wave length associated with a proton moving with a velocity of 2200 m sec. (h = 6.625 ´ 10–34J–S, m =1.6 ´ 10–27kg)

7.
A neutron breaks into a proton and an electron. Calculate the mass defect in the reaction. (mp = 1.6725 ´ 10–27kg, me =9 ´ 10–31 kg, mn = 1.6747 ´ 10–27kg)

8.
X–rays of wave length 1.54A0 are diffracted by a crystal. The incident angle 110.

SECTION – B

II.
Answer ALL of the following questions:
5 x 10 = 50 M

9.
a)
Describe stern and Gerlach experiment. What is its importance ?


(OR)


b)
What is Raman Effect ? How it is experimentally studied.

10.
a)
Explain De–Broglie hypothesis for matter waves. Derive an expression for De–Broglie wave length.


(OR)


 b)
Explain Devison and Gerner experiment for detection of matter waves.

11.
a)
Derive Schrodinger’s time independent wave equation.


(OR)


 b)
Obtain an expression for the energy of a particle in one dimensional potential wall.

12.
a)
Explain magic numbers using nuclear shell model.


(OR)


 b)
Explain Gamow theory of a–decay ?

13.
a)
Describe laue method for the study of crystal structure.


(OR)


 b)
What is super conductivity ? Explain Meissner effect. Mention the properties of super conductivity.


THE END

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