Atomic & Molecular Physics-Population Inversion (CSIR (Council of Scientific & Industrial Research) Physical Sciences): Questions 1 - 2 of 2

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Question number: 1

» Atomic & Molecular Physics » Population Inversion

Appeared in Year: 2012

MCQ▾

Question

Consider the energy level diagram shown below, which corresponds to the molecular nitrogen laser.

 The energy level diagram

the Energy Level Diagram

In figure the energy level diagram is shown.

If the pimp rate R is and the decay routes are as shown with and , the equilibrium populations of states 2 and 1 are respectively. (December)

Choices

Choice (4) Response

a.

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: 2 (1 of 1 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

a.

b.

c.

d.

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