GATE (Graduate Aptitude Test in Engineering) Physics: Questions 7 - 9 of 659

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Question number: 7

» Classical Mechanics » Conservation Laws

Appeared in Year: 2014

MCQ▾

Question

The recoil momentum of an atom is when it emits an infrared photon of wavelength , and it is when it emits a photon of visible wavelength . The ratio is –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 8

» Thermodynamics and Statistical Physics » Macrostates and Microstates

Appeared in Year: 2015

MCQ▾

Question

Consider a system of N non – interacting spin particles, each having a magnetic moment , is in a magnetic field . If is the total energy of the system, the number of accessible microstates is given by,

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 9

» Atomic and Molecular Physics » X-Ray Spectra

Appeared in Year: 2014

MCQ▾

Question

The energy, for band electrons as a function of the wave vector, in the first Brillouin zone of a one dimensional monatomic lattice is shown as ( is lattice constant)

The energy as a function of the wave vector

The Energy as a Function of the Wave Vector

In figure the energy for band electrons as a function of the wave vector in the first Brillouin zone of a one dimensional monatomic lattice is shown as.

The variation of the group velocity is most appropriately represented by

Choices

Choice (4) Response

a.

The variation of the group velocity - Choice – A

The Variation of the Group Velocity - Choice – A

In figure the variation of the group velocity with respect to wavevector is shown.

b.

The variation of the group velocity - Choice – B

The Variation of the Group Velocity - Choice – B

In figure the variation of the group velocity with respect to wavevector is shown.

c.

The variation of the group velocity - Choice – C

The Variation of the Group Velocity - Choice – C

In figure the variation of the group velocity with respect to wavevector is shown

d.

The variation of the group velocity - Choice – D

The Variation of the Group Velocity - Choice – D

In figure the variation of the group velocity with respect to wavevector is shown

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