JEE Questions for Physics Electromagnetic Waves Quiz 6 - MCQExams.com


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Infrared radiations are detected by
  • Spectrometer
  • Bolometer
  • Photocells
  • Geiger tubes

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  • 4A
  • 3A
  • 2A
  • 1A
Which of the following electromagnetic wave has the least frequency?
  • Radiowave
  • Infrared radiation
  • Microwave
  • X rays
Which of the following electromagnetic wave has the least wavelength?
  • Radiowave
  • Visible wave
  • Ultraviolet rays
  • Microwaves
Which of the following waves are not transverse in nature?
  • light emitted from a sodium lamp
  • sound waves travelling in air
  • xrays from an x ray machine
  • microwaves used in radar
An electromagnetic wave
  • can be deflected by electric field
  • can be deflected by magnetic field
  • can be deflected bye both electric and magnetic field
  • none of these
When an electromagnetic wave encounters a dielectric medium, the transmitted wave has
  • same frquency but different amplitude
  • same amplitude but different frequency
  • same frequency and amplitude
  • different frequency and amplitude
According to Maxwell, a changing electric field produces ___________
  • emf
  • radiation pressure
  • electric current
  • magnetic field
______________ was the first to predict the existence of electromagnetic waves
  • Maxwel
  • Faraday
  • Ampere
  • Hertz
If the earth were not having atmosphere, its temperature ___________
  • would have been low
  • would have been high
  • would have remain constant
  • none of these
______________ is responsible for the green house effect
  • infrared rays
  • ultraviolet rays
  • x rays
  • radiowaves
The dimensional formula of energy density is

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The electric field of a plane electromagnetic wave varies with time of amplitude 2 Vm -1 propagating along Z-axis. The average energy density of the magnetic field is (in Jm-3)
  • 13.29 × 10-12
  • 8.85 × 10-12
  • 17.72 × 10-12
  • 4.43 × 10-12
  • 2.22 × 10-12
The average value of electric energy density in an EM wave is (E0 is peak value)

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If μ0 is permeability of free space and ε0 is permittivity of free space, the speed of light in vacuum is given by

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A plane electromagnetic wave travelling along the X- direction has a wavelength of 3 mm. The variation in the electric field occurs in the Y-direction with an amplitude 66 Vm-1. The equations for the electric and magnetic fields as a function of x and t are respectively

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If c is the speed of electromagnetic waves in vacuum, its speed in a medium of dielectric constant K and relative permeability μ is

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A. The wavelength of microwaves is greater than that of ultraviolet rays.
B. The wavelength of infrared rays is lesser than that of ultraviolet rays.
C. The wavelength of microwaves is lesser than that of infrared rays.
D. γ - rays have shortest wavelength in the electromagnetic spectrum.
Choose correct option of the above statements
  • A and B are correct
  • B and C are correct
  • C and D are correct
  • A and C are correct
  • A and D are correct
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