CSIR (Council of Scientific & Industrial Research) Physical Sciences: Questions 323 - 328 of 463

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Passage

Light of wavelength 660 nm and power of is incident on a semiconductor photodiode with an absorbing layer of thickness of .

Question number: 323 (1 of 2 Based on Passage) Show Passage

» Electronics and Experimental Methods » Opto-Electronic Devices » Photo-Detectors

MCQ▾

Question

If the absorption coefficient at this wavelength is and if power is lost on reflection at the surface, the power absorbed will be –

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Choice (4) Response

a.

b.

c.

d.

Question number: 324 (2 of 2 Based on Passage) Show Passage

» Electronics and Experimental Methods » Opto-Electronic Devices » Photo-Detectors

MCQ▾

Question

The generated photo – current for a quantum efficiency of unity will be –

Choices

Choice (4) Response

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b.

c.

d.

Passage

The magnetic field of the mode of a rectangular waveguide of dimensions as shows in the figure is given by , where and are in cm.

 The magnetic field of a mode of a rectangular waveguide

the Magnetic Field of a Mode of a Rectangular Waveguide

In figure the magnetic field of a mode of a rectangular waveguide is shown.

Question number: 325 (1 of 2 Based on Passage) Show Passage

» Electromagnetic Theory » Electromagnetic Waves in Free Space

MCQ▾

Question

The entire range of frequencies for which the mode will propagate is:

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Choice (4) Response

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b.

c.

d.

Question number: 326 (2 of 2 Based on Passage) Show Passage

» Electromagnetic Theory » Electromagnetic Waves in Free Space

MCQ▾

Question

The dimensions of the waveguide are –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 327

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

Gas molecules of mass ‘m’ are confined in a cylinder of radius R and height L (With R > > L) kept vertically in the Earth’s gravitational field. The average energy of the gas at low temperature (such that ) is given by, (December)

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 328

» Classical Mechanics » Lagrangian and Hamiltonian Formalism and Equations of Motion

Appeared in Year: 2011

MCQ▾

Question

A particle of mass ‘m’ moves inside a bowl. If the surface of the bowl is given by the equation where, is a constant, the Lagrangian of the particle is: (December)

Choices

Choice (4) Response

a.

b.

c.

d.

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