GATE (Graduate Aptitude Test in Engineering) Physics: Questions 118 - 123 of 659

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Question 118

Appeared in Year: 2016

Question

MCQ▾

The electric field component of a plane electromagnetic wave travelling in vacuum is given by . The Poynting vector for the wave is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 119

Appeared in Year: 2012

Question

MCQ▾

A rod of proper length oriented parallel to the X- axis moves with speed along the Y – axis in the S – frame, where C is the speed of light in free space. The observer is also moving along the X – axis with speed with respect to the S – frame. The length of the rod as measured by the observer is

Choices

Choice (4)Response

a.

b.

c.

d.

Question 120

Appeared in Year: 2012

Question

MCQ▾

The number of independent component of the symmetric with indices is –

Choices

Choice (4)Response

a.

9

b.

1

c.

3

d.

6

Passage

The dispersion relation for a one – dimensional monatomic crystal with lattice spacing a, which interacts via nearest neighbor harmonic potential is given by, , where is a constant of appropriate unit.

Question 121 (1 of 2 Based on Passage)

Appeared in Year: 2012

Question

MCQ▾

The force constant between the nearest neighbors of the lattice is –

(M is the mass of the atom)

Choices

Choice (4)Response

a.

b.

c.

d.

Question 122 (2 of 2 Based on Passage)

Appeared in Year: 2012

Question

MCQ▾

The group velocity at the boundary of the first Brillouin zone is –

Choices

Choice (4)Response

a.

1

b.

c.

d.

0

Question 123

Appeared in Year: 2012

Question

MCQ▾

Given , where is a constant vector and is the position vector. The value of , where is a circle of unit radius centered at origin is,

Choices

Choice (4)Response

a.

1

b.

c.

d.

0

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