JEE Questions for Physics Electromagnetic Waves Quiz 5

The electromagnetic waves do not transport _________

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Energy
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Charge
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Momentum
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Information

An electric charge oscillating with a frequency of 1kilo cycles/s can radiates electromagnetic waves of wavelength

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100km
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200km
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300km
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400km

The frequency 1057MHz of radiation arising from two close energy levels in hydrogen belongs to ________

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radio waves
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infrared waves
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micro waves
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γ rays

Electromagnetic waves travelling in a medium which has relative permeability 1.3 and relative permeability 2.14 speed of electromagnetic waves in this medium will be _________

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2)
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Maxwell’s modified form of Ampere’s circuital law is ___________

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2)
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A point source of electromagnetic radiation has an average output power of 800W. The maximum value of electric field at a distance of 4.0m from the source is

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2)
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1.5
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2.0
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2.4
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4.0

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2)
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An observer is at 2m from an isotropic point source of light emitting 40w power.The rm.s value of electric due to the source at the position of the observer is_________

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2)
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Electromagnetic waves used in medicine to destroy cancer cells

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radio waves
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infrared rays
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gamma rays
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ultraviolet rays

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Gauss law for electricity
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Gauss law for magnetism
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Ampere’s law
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Faraday’s law

What oscillates in an electromagnetic wave?

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2)
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None of these

The rms value of the electric field of the light coming from the sun is 720 N/c. The average tatal energy density of the electromagnetic wave is

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What is the wave length of range of electromagnetic waves?

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What is the wavelength range of visible light?

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2)
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Current
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Resistance
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Electric charge
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velocity

In electromagnetic spectrum, the visible light lie between

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radiowaves and microwaves
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ultraviolet rays and infrared rays
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ultraviolet rays and x rays
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infrared rays and microwaves

Which of the following statements is not true in case of electromagnetic waves?

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they are light waves
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they are transverse waves
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propagates through space
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they are longitudinal waves

The oscillating electric and magnetic field vectors of an electromagnetic waves far away from source are oriented along

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Mutually perpendicular direction and differ in phase by 90o
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Mutually perpendicalar and in same phase
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In same direcfi on and in same phase
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In same divecfi on and differ in phase by 90o

Which of the following option of electromagnetic waves is in order of increasing frequency ?

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microwaves, ultraviolet rays, x rays
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gamma rays, ultraviolet rays, radiowaves
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radiowaves, visible light, infrared rays
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gamma rays, visible light, ultraviolet rays

The sum delivers10³ Wm^–2 of electromagnetic flux to earth’s surface. The total power that is incident on a roof of dimension 8m x 20m will be

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2)
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Bolometer is used to detect ______________

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infrared rays
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ultraviolet rays
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x rays
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γ rays

Range of frequency of microwaves is about __________

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530kHz to 1710kHz
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54MHz to 890MHz
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3GHz to 300GHz
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SI unit of displacement current is

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Coulomb
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Ampere
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Faraday
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Candela

The frequencies of x rays, γ rays and ultraviolet rays are respectively p, q and r then

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p < q, q > r
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p > q, q > r
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p > q, q < r
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p < q, q < r

At room temperature, if the relative permitivity of water is 80 and the realtive permiability be 0.0222 then the velocity of light in water is __________ m/s