CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 384  387 of 463
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Question number: 384
» Electromagnetic Theory » Laplace and Poisson Equations
Appeared in Year: 2011
Question
A static, spherically symmetric charge distribution is given by , where A and K are positive constants. The electrostatic potential corresponding to this charge distribution varies with as, (June)
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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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