CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 385 - 389 of 463

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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)

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» 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 –

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Choice (4) Response

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Question number: 386 (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:

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Passage

In the absence of an applied torque a rigid body with three distances principal moments of inertia given by is rotating freely about a fixed point inside the body. The Euler equations for the components of its angular velocity are

(June)

Question number: 387 (1 of 2 Based on Passage) Show Passage

» Classical Mechanics » Rigid Body Dynamics - Moment of Inertia Tensor

Appeared in Year: 2011

MCQ▾

Question

The constant of motion are –

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Question number: 388 (2 of 2 Based on Passage) Show Passage

» Mathematical Methods of Physics » Eigenvalues and Eigenvectors

Appeared in Year: 2011

MCQ▾

Question

The equilibrium points in space are –

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Passage

Consider the matrix (June)

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» Mathematical Methods of Physics » Taylor & Laurent Series

Appeared in Year: 2011

MCQ▾

Question

The exponential of M simplifies to (I is the identity matrix)

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Choice (4) Response

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