GATE Physics: Questions 85 - 88 of 290

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Question number: 85

» Solid State Physics » Diffraction Methods for Structure Determination

Appeared in Year: 2014

Short Answer Question▾

Write in Short

Neutrons moving with speed 103ms are used for the determination of crystal structure. If the Bragg angle for the first order diffraction is 30° , the interplanar spacing of the crystal is __________ .

(Given: mn=1.675×1027kg,h=6.626×1034Js )

Question number: 86

» Electromagnetic Theory » Interference

Appeared in Year: 2014

MCQ▾

Question

In an interference pattern formed by two coherent sources, the maximum and the minimum of the intensities are 9I0 and I0 , respectively. The intensities of the individual waves are –

Choices

Choice (4) Response
a.

5I0and4I0

b.

3I0andI0

c.

9I0andI0

d.

4I0andI0

Question number: 87

» Electronics » Bipolar Junction Transistors

Appeared in Year: 2015

Short Answer Question▾

Write in Short

In the simple current source shown in the figure, Q1 and Q2 are identical transistors with current gain β=100 and VBE=0.7V .

Current mirror circuit

Current Mirror Circuit

The circuit is shows the current mirror circuit consists of Q1 and Q2 are two identical transistors.

The current I0(inmA) is ________ (upto two decimal places)

Question number: 88

» Mathematical Physics » Fourier Analysis

Appeared in Year: 2015

MCQ▾

Question

The Heaviside function is defined as,

H(t)={+1,fort>01,fort<0

And its Fourier transform is given by 2iω . The Fourier transform of, 12[H(t+12)H(t12)] is –

Choices

Choice (4) Response
a.

cos(ω2)ω2

b.

sin(ω2)

c.

sin(ω2)ω2

d.

0

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