Solid State Physics [GATE (Graduate Aptitude Test in Engineering) Physics]: Questions 65 - 68 of 68

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Question 65

Appeared in Year: 2006

Question

MCQ▾

Which one of the following is not a correct statement about semiconductors?

Choices

Choice (4)Response

a.

The electrons and holes have different mobility in a semiconductor

b.

Silicon has diamond structure

c.

Silicon is a direct band gap semiconductor

d.

In an type semiconductor, the Fermi level lies closer to the conduction band edge

Question 66

Appeared in Year: 2017

Question

MCQ▾

The real space primitive lattice vectors are and . The reciprocal space unit vectors and for this lattice are, respectively;

Choices

Choice (4)Response

a.

and

b.

and

c.

and

d.

and

Question 67

Solid State Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

The total energy of an inert – gas crystal is given by , where is the inter – atomic spacing in Angstroms. The equilibrium separation between the atoms is ________ Angstroms. (up to two decimal places) .

Explanation

Here, the total energy of an inert – gas crystal is given,

Where, is the inter – atomic spacing in Angstroms.

If at equilibrium, separation between atoms is , then becomes minimum. Therefore,

… (2 more words) …

Question 68

Solid State Physics

Appeared in Year: 2017

Describe in Detail

Essay▾

The Compton wavelength of a proton is . (up to two decimal places) .

Explanation

The Compton wavelength of proton is given as,

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