GATE (Graduate Aptitude Test in Engineering) Physics: Questions 495 - 498 of 659

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Question 495

Appeared in Year: 2007

Question

MCQ▾

An extrinsic semiconductor sample of cross – section and length is doped in such a way that the doping concentration varies as , where is a constant. Assume that the mobility of the majority carriers remains constant. The resistance of the sample is given by –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 496

Appeared in Year: 2008

Question

MCQ▾

A neutral pi meson has a rest – mass of approximately and a lifetime of . A produced in the laboratory is found to decay after into two photons. Which of the following sets represents a possible set of energies of the two photons as seen in the laboratory?

Choices

Choice (4)Response

a.

b.

c.

d.

Question 497

Appeared in Year: 2008

Question

MCQ▾

The lattice specific heat of a crystalline solid can be obtained using the Dulong Petit model, Einstein model and Debye model. At low temperature ; Which one of the following statement is true ( and are constant) –

Choices

Choice (4)Response

a.

Dulong Petit: ; Einstein ; Debye:

b.

Dulong Petit: ; Einstein ; Debye:

c.

Dulong Petit: ; Einstein: ; Debye:

d.

Dulong Petit: ; Einstein ; Debye:

Question 498

Appeared in Year: 2008

Question

MCQ▾

Metallic monovalent sodium crystallizes in body centered cubic structure. If the length of the unit cell is , the concentration of conduction electrons in metallic sodium is –

Choices

Choice (4)Response

a.

b.

c.

d.

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