CSIR Physical Sciences: Questions 156 - 158 of 389

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Question number: 156

» Electromagnetic Theory » Electromagnetic Waves in Free Space

Appeared in Year: 2011

MCQ▾

Question

A plane electromagnetic wave is propagating in a lossless dielectric. The electric field is given by E(x,y,z,t)=E0(x^+Az^)exp[ik0{ct+(x+3z)}] , where c is the speed of light in vacuum, E0 , A and k0 are constant and x^ and z^ are unit vectors along the x and z – axes. The relative dielectric constant of the medium, εr and the constant A are – (June)

Choices

Choice (4) Response
a.

εr=4andA=+13

b.

εr=4andA=3

c.

εr=4andA=3

d.

εr=4andA=13

Question number: 157

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2011

MCQ▾

Question

If the number density of a free electron gas in three electron gas in three dimensions is increase eight times, its Fermi temperature will –

(December)

Choices

Choice (4) Response
a.

Increase by a factor of 4

b.

Decrease by a factor of 8

c.

Increase by a factor of 8

d.

Decrease by a factor of 4

Question number: 158

» Electromagnetic Theory » Reflection and Refraction

Appeared in Year: 2014

MCQ▾

Question

A plane electromagnetic wave incident normally on the surface of a material is partially reflected. A measurement on the standing wave in the front of the interface shows that the ratio of the electric field amplitude at the maxima and the minima is 5. The ratio of the reflected intensity to the incident intensity is (December)

Choices

Choice (4) Response
a.

25

b.

23

c.

15

d.

49

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