Atomic & Molecular Physics (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 15 - 18 of 19

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Question number: 15

» Atomic & Molecular Physics » Born-Oppenheimer Approximation

Appeared in Year: 2011

MCQ▾

Question

The difference in the Coulomb energy between the mirror nuclei and is . Assuming that the nuclei have a spherically symmetric charge distribution and that is approximately the radius of the nucleus is – (December)

Choices

Choice (4) Response

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b.

c.

d.

Question number: 16

» Atomic & Molecular Physics » LS & JJ Couplings

Appeared in Year: 2012

MCQ▾

Question

The ground state of nucleus has spin – parity , while the first excited state has . The electromagnetic radiations emitted when the nucleus makes a transition from the first excited state to the ground state are, (June)

Choices

Choice (4) Response

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b.

c.

d.

Passage

Chromium ions cubic centimeter. All the atoms excited by the radiation decay rapidly to level which has a lifetime

Three energy levels for Chromium ions

Three Energy Levels for Chromium Ions

In figure three distinct energy levels are shown. All atoms excited by radiation decay.

(June)

Question number: 17 (1 of 2 Based on Passage) Show Passage

» Atomic & Molecular Physics » Optical Pumping

Appeared in Year: 2011

MCQ▾

Question

The minimum pump power required (per cubic centimeter) to bring the system to transparency, i. e. , zero gain, is –

Choices

Choice (4) Response

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b.

c.

d.

Question number: 18 (2 of 2 Based on Passage) Show Passage

» Atomic & Molecular Physics » Population Inversion

Appeared in Year: 2011

MCQ▾

Question

Assuming that there is no radiation of wavelength present in the pumping cycle and that the pumping rate is R atoms per , the population density in the level builds up as:

Choices

Choice (4) Response

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b.

c.

d.

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