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
(June)
Question number: 385 (1 of 2 Based on Passage) Show Passage
» Atomic & Molecular Physics » Optical Pumping
Appeared in Year: 2011
Question
The minimum pump power required (per cubic centimeter) to bring the system to transparency, i. e. , zero gain, is –
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Question number: 386 (2 of 2 Based on Passage) Show Passage
» Atomic & Molecular Physics » Population Inversion
Appeared in Year: 2011
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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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
» Mathematical Methods of Physics » Eigenvalues and Eigenvectors
Appeared in Year: 2011
Question
The equilibrium points in space are –
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Question number: 388 (2 of 2 Based on Passage) Show Passage
» Classical Mechanics » Rigid Body Dynamics  Moment of Inertia Tensor
Appeared in Year: 2011
Question
The constant of motion are –
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Passage
Consider the matrix (June)
Question number: 389 (1 of 1 Based on Passage) Show Passage
» Mathematical Methods of Physics » Taylor & Laurent Series
Appeared in Year: 2011
Question
The exponential of M simplifies to (I is the identity matrix)
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