III B.Sc. : Physics Paper VI Semester-V Modern Physics Model Paper 2017
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III B.Sc. : Physics Paper VI
Semester-V Modern Physics Model Paper 2017
SECTION
– A
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I.
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Answer any
FIVE of the following questions:
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5
x 5 = 25 M
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1.
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Explain L–S coupling and J–J coupling.
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2.
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Explain Raman Effect and symmetry of Raman
lines on the basis of quantum theory.
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3.
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Explain liquid drop
model.
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4.
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Explain
miller–indices.
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5.
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Explain Basic
Postulates of Quantum Mechanics.
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6.
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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)
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7.
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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)
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8.
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X–rays of wave
length 1.54A0 are diffracted by a crystal. The incident angle 110.
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SECTION – B
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II.
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Answer ALL
of the following questions:
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5
x 10 = 50 M
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9.
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a)
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Describe stern and Gerlach experiment. What
is its importance ?
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(OR)
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b)
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What is Raman Effect ? How it is
experimentally studied.
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10.
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a)
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Explain De–Broglie
hypothesis for matter waves. Derive an expression for De–Broglie wave length.
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(OR)
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b)
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Explain Devison and
Gerner experiment for detection of matter waves.
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11.
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a)
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Derive
Schrodinger’s time independent wave equation.
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(OR)
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b)
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Obtain an expression
for the energy of a particle in one dimensional potential wall.
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12.
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a)
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Explain magic
numbers using nuclear shell model.
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(OR)
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b)
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Explain Gamow
theory of a–decay ?
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13.
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a)
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Describe laue
method for the study of crystal structure.
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(OR)
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b)
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What is super
conductivity ? Explain Meissner effect. Mention the properties of super
conductivity.
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THE END
