GATE (Graduate Aptitude Test in Engineering) Physics: Questions 135 - 138 of 659

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Question 135

Appeared in Year: 2012

Question

MCQ▾

At a certain temperature T, the average speed of nitrogen molecules in air is found to be . The most probable and the root mean square speeds of the molecules are, respectively –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 136

Appeared in Year: 2012

Question

MCQ▾

The space – time dependence of the electric field of a linearly polarized light in free space is given by where and are the amplitude, the angular frequency and the wavevector, respectively. The time average energy density associated with the electric field is –

Choices

Choice (4)Response

a.

b.

c.

d.

Question 137

Appeared in Year: 2012

Question

MCQ▾

A particle of mass is confined in a two dimensional square well potential of dimension . This potential is given by,

The energy of the first excited state for this particle is given by,

Choices

Choice (4)Response

a.

b.

c.

d.

Question 138

Appeared in Year: 2012

Question

MCQ▾

Consider the following circuit in which the current gain of the transistor is 100.

Circuit Consisting a Transistor

Which one of the following correctly represents the load line (collector current with respect to collector – emitter voltage ) and Q – point of this circuit?

Choices

Choice (4)Response

a.

Collector Current vs Collector – Emitter Voltage (Choice A)

b.

Collector Current vs Collector – Emitter Voltage (Choice B)

c.

Collector Current vs Collector – Emitter Voltage (Choice C)

d.

Collector Current vs Collector – Emitter Voltage (Choice D)

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