Quantum Mechanics II & Atomic Physics-Atomic Physics [Optionals IAS Mains Physics]: Questions 1 - 8 of 15

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Question 1

Atomic Physics
Spectroscopic Notation of Atomic States
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Appeared in Year: 2011 (IFS)

Describe in Detail

Essay▾

Obtain the term symbols for two singlet states and two triplet states for two electron atoms. (Paper-2) (Section-A)

Explanation

If we knowing the value of various types of angular momenta, term symbols gives three kinds of information,

Total orbital angular momentum, L

Multiplicity of the terms,

Total angular momentum,

Vectors Sum of Angular Momentum
  • We can do vector sums of these vector. But it becomes easy if we consider components as these add together as scalars.
  • Theref…

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Question 2

Atomic Physics
Stern-Gerlack Experiment
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Appeared in Year: 2000

Describe in Detail

Essay▾

Describe the Stern-Gerlach experiment and discuss its significance. (20 Marks)

Explanation

  • Description of the experiment: First, silver (Ag) atoms are heated in an oven. The oven has a small hole through which some of the silver atoms escape. As shown in figure (1) , the beam gees through a collimator and is then subjected to an inhomogeneous magnetic field produced by a pair of pole pieces, one of which has a very sharp edge.
  • We now must…

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Question 3

Atomic Physics
Stern-Gerlack Experiment
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Appeared in Year: 2004

Describe in Detail

Essay▾

Describe Stern – Gerlach experiment and discuss its implications.

Explanation

First, silver atoms are heated in an oven. The oven has a small hole through which some of the silver atoms escape. As shown in Fig (1) , the beam goes through a collimator and is then subjected to an inhomogeneous magnetic field produced by a pair of pole pieces, one of which has a very sharp edge.

We must now work out the effect of the magnetic f…

… (551 more words) …

Question 4

Atomic Physics
Electron Spin

Appeared in Year: 2004

Describe in Detail

Essay▾

What are the term symbols for atoms with the following (total spin) and (total orbital) quantum numbers, ?

Explanation

The term symbols are denoted by

Since ,

Corresponds to state

Lies between to

to

,

Term symbols are and

Question 5

Atomic Physics
Zeeman Effect

Appeared in Year: 2004

Describe in Detail

Essay▾

Calculate the Zeeman shift observed in the normal Zeeman Effect when a spectral lime of wave length is subjected to the magnetic field of .

Explanation

The wave number separation between the components of a normal Zeeman triplet is given by

Putting the values

Now

Question 6

Atomic Physics
Stern-Gerlack Experiment
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Appeared in Year: 2007

Describe in Detail

Essay▾

Describe Stern – Gerlach experiment. Explain how it demonstrate the discrete nature of the magnetic moment of atom.

Explanation

  • In this experiment, silver (Ag) atoms are heated in an oven, the oven has a small hole through which some of the silver atoms escape. As shown in fig (1) the beam goes through a collimator and is subjected to an inhomogeneous magnetic field produced by a pair of pole piece, one of which has a very sharp edge.
  • We must now work out on the effect of th…

… (529 more words) …

Question 7

Atomic Physics
J-J Coupling
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Appeared in Year: 2016

Describe in Detail

Essay▾

Explain in detail L – S coupling and j – j coupling schemes.

Explanation

L – S coupling:

  • The L – S coupling is also known as “Russell - Saunders” coupling. In atoms which obey this coupling we introduce the various perturbations in the order: (a) spin – spin correlation (b) residual electrostatic interaction (c) spin – orbit interaction

(a) As a result of spin – spin correlation effect, the individual spin angular momentu…

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Question 8

Atomic Physics
Spectroscopic Notation of Atomic States
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Appeared in Year: 2010

Describe in Detail

Essay▾

What are magic numbers? Discuss shell structure of a nucleus. How is this model able to explain various properties of nuclei? Discuss the limitations of this model. (25 marks)

Explanation

The electrons in an atom may be thought of as occupying positions in “shells” designated by the various principal quantum numbers. The degree of occupancy of the outermost shell is what determines aspects of an atom behaviour. For instance, atoms with etc have all their electron shells completely filled. Such electron structures have high binding …

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