CSIR Physical Sciences: Questions 324 - 328 of 401

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Passage

Light of wavelength 660 nm and power of 1mW is incident on a semiconductor photodiode with an absorbing layer of thickness of ln4μm .

Question number: 324 (2 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 104cm1 and if 1% power is lost on reflection at the surface, the power absorbed will be –

Choices

Choice (4) Response

a.

250μW

b.

225μW

c.

750μW

d.

675μW

Passage

The magnetic field of the TE11 mode of a rectangular waveguide of dimensions a×b as shows in the figure is given by Hz=H0cos(0.3πx)cos(0.4πy) , where x and y 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 dimensions of the waveguide are –

Choices

Choice (4) Response

a.

a=0.80cm,b=0.60cm

b.

a=1.66cm,b=1.25cm

c.

a=3.33cm,b=2.50cm

d.

a=0.40cm,b=0.30cm

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

» Electromagnetic Theory » Electromagnetic Waves in Free Space

MCQ▾

Question

The entire range of frequencies f for which the TE11 mode will propagate is:

Choices

Choice (4) Response

a.

7.5GHz<f<9.0GHz

b.

6.0GHz<f<7.5GHz

c.

7.5GHz<f<12.0GHz

d.

7.5GHz<f

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 mgLkBT ) is given by, (December)

Choices

Choice (4) Response

a.

2NkBT

b.

NkBT2

c.

3NkBT2

d.

5NkBT2

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 z=12a(x2+y2) where, a is a constant, the Lagrangian of the particle is: (December)

Choices

Choice (4) Response

a.

12m(r˙2+r2ϕ˙2gar2)

b.

12m[(1+a2r2)r˙2+r2ϕ˙2]

c.

12m[(1+a2r2)r˙2+r2ϕ˙2gar2]

d.

12m(r˙2+r2θ˙2+r2sin2θϕ˙2gar2)

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