Electromagnetic Theory (GATE Physics): Questions 1 - 4 of 36

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Question number: 1

» Electromagnetic Theory » Diffraction and Polarization

Appeared in Year: 2015

Short Answer Question▾

Write in Short

A beam of X – ray of intensity I0 is incident normally on a metal sheet of thickness 2 mm. The intensity of the transmitted beam is 0.025I0 . The linear absorption coefficient of the metal sheet (in per m) is ________ (up to one decimal place).

Question number: 2

» Electromagnetic Theory » Electromagnetic Waves and Their Reflection

Appeared in Year: 2015

MCQ▾

Question

A plane wave (x^+iy^)E0exp[i(kzωt)] after passing through an optical element emerges as (x^iy^)E0exp[i(kzωt)] , where k and ω are the wavevector and the angular frequency, respectively. The optical element is a –

Choices

Choice (4) Response

a.

Faraday rotator

b.

Polarizer

c.

Quarter wave plate

d.

Half wave plate

Question number: 3

» Electromagnetic Theory » Interference

Appeared in Year: 2016

Short Answer Question▾

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In a Young’s double slit experiment using light, the apparatus has two slits of unequal widths. When only slit – 1 is open, the maximum observed intensity on the screen is 4I0 . When only slit – 2 is open, the maximum observed intensity is I0 . When both the slits are open, an interference pattern appears on the screen. The ratio of the intensity of the principal maximum to that of the nearest minimum is _ .

Question number: 4

» Electromagnetic Theory » Electromagnetic Waves and Their Reflection

Appeared in Year: 2014

MCQ▾

Question

A particle of mass m is in a potential given by, V(r)=a4+ar023r3

Where a and r0 are positive constants. When disturbed slightly from its stable equilibrium position, it undergoes a simple harmonic oscillation. The time period of oscillation is –

Choices

Choice (4) Response

a.

2π2mr03a

b.

2πmr03a

c.

2πmr032a

d.

4πmr03a

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