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 Equation and the decay routes are as shown with Equation and Equation , the equilibrium populations of states 2 and 1 are respectively. (December)

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Passage

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

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 Equation present in the pumping cycle and that the pumping rate is R atoms per Equation , the population density in the level Equation builds up as:

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

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