# Electromagnetic Theory (GATE Physics): Questions 1 - 4 of 82

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## Question number: 1

» Electromagnetic Theory » Diffraction and Polarization

Appeared in Year: 2015

### Write in Short

A beam of X – ray of intensity is incident normally on a metal sheet of thickness 2 mm. The intensity of the transmitted beam is . 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 after passing through an optical element emerges as , where and are the wavevector and the angular frequency, respectively. The optical element is a –

### Choices

Choice (4) Response

a.

b.

Polarizer

c.

Quarter wave plate

d.

Half wave plate

## Question number: 3

» Electromagnetic Theory » Interference

Appeared in Year: 2016

### Write in Short

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 . When only slit – 2 is open, the maximum observed intensity is . 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 is in a potential given by,

Where and 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.

b.

c.

d.

f Page