GATE (Graduate Aptitude Test in Engineering) Physics: Questions 17 - 21 of 659

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Question 17

Appeared in Year: 2014

Question

MCQ▾

For a system of two bosons, each of which can occupy any of the two energy levels 0 and , the mean energy of the system at a temperature with is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 18

Appeared in Year: 2014

Write in Short

Short Answer▾

A hydrogen atom is in the state

Where in denote the principal, orbital and magnetic quantum numbers, respectively. If is the angular momentum operator, the average value of is________ .

Question 19

Appeared in Year: 2015

Write in Short

Short Answer▾

The lattice parameters of an orthorhombic crystal are related by . In units of , the inter-planar separation between the planes is ________ (up to three decimal places)

Question 20

Appeared in Year: 2015

Write in Short

Short Answer▾

The bad gap of an intrinsic semiconductor is and . At 300 K, the Fermi level with respected to the edge of the valence band (in eV) is at ________ (up to three decimal places)

Question 21

Appeared in Year: 2014

Write in Short

Short Answer▾

If the half – life of an elementary particle moving with speed in the laboratory frame is , then the proper half – life is ________ .

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