JEE Questions for Physics Electromagnetic Waves Quiz 2 - MCQExams.com

In an electromagnetic wave the average energy density associated with electric field is

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  • 2)
    Physics-Electromagnetic Waves-69727.png

  • Physics-Electromagnetic Waves-69728.png

  • Physics-Electromagnetic Waves-69729.png
Clouds are contained in a layer from the earth’s surface, which is called
  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
Radio waves of constant amplitude can be generated with
  • rectifier
  • filter
  • F.E.T
  • Oscillator
If a source is transmitting electromagnetic wave of frequency 8.2 × 106 Hz, then wavelength of the electro-magnetic waves transmitted from the source will be
  • 36.6 m
  • 40.5 m
  • 42.3 m
  • 50.9 m
Which of the following rays are not electromagnetic wave?
  • X-rays
  • γ-rays
  • β-rays
  • heat rays
An electromagnetic wave of frequency v = 3.0 MHz passes vacuum into a delectric medium with permittivity ∈ = 4.0. Then
  • wavelength is doubled and the frequency remains unchanged
  • wavelength is doubled and frequency becomes half
  • wavelength is halved and frequency remains unchanged
  • wavelength and frequency both remain unchanged
If λv, λx and λm represent the wavelengths of visible light, x-rays and microwave respectively, then
  • λm > λx > λv
  • λv > λm > λx
  • λv > λx > λm
  • λm > λv > λx

Physics-Electromagnetic Waves-69732.png
  • 0.46 rad m-1
  • 3 rad m-1
  • 1.66 rad m-1
  • 0.83 rad m-1

Physics-Electromagnetic Waves-69734.png
  • [ML2T-1]
  • [ML-1T-2]
  • [ML2T-2]
  • [MLT-1]
An electromagnetic wave in vacuum has the electric and magnetic fields E and B, which are always perpendicular to each other. The direction of polarisation is given by X and that of wave propagation by k. Then,

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  • 2)
    Physics-Electromagnetic Waves-69737.png

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  • Physics-Electromagnetic Waves-69739.png
The amplitude of the magnetic field part of a harmonic electromagnetic wave in vacuum is B0 = 510 nT. What is the amplitude of the electric field part of the wave?
  • 140 NC-1
  • 153 NC-1
  • 163 NC-1
  • 133 NC-1
A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. Frequency of the electromagnetic wave produced by the oscillator is
  • 10 Hz
  • 105 Hz
  • 109 Hz
  • 1010 Hz
The electric field of an electromagnetic wave travelling through vacuum is given by the equation E = E0 sin (kx - ωt). The quantity that is independent of wavelength is

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  • 2)
    Physics-Electromagnetic Waves-69748.png

  • Physics-Electromagnetic Waves-69749.png

  • Physics-Electromagnetic Waves-69750.png

  • Physics-Electromagnetic Waves-69751.png
An electromagnetic wave is propagating along x-axis. At x = 1cm and t =10 s, its electric vector |E| = 6 V/m, then the magnitude of its magnetic vector is
  • 2 × 10-8
  • 3 × 10-7
  • 6 × 10-8
  • 5 × 10-7

Physics-Electromagnetic Waves-69754.png
  • 6.28 mm
  • 3.14 mm
  • 0.63 cm
  • 0.32 mm
If a source is transmitting electromagnetic waves of frequency 8.196 × 106 Hz, then the wavelength of the electromagnetic waves transmitted from the source will be
  • 5090 cm
  • 4050 cm
  • 4230 cm
  • 3660 cm
The phase velocity (vp) of travelling waves is

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  • 2)
    Physics-Electromagnetic Waves-69758.png

  • Physics-Electromagnetic Waves-69759.png

  • Physics-Electromagnetic Waves-69760.png
If 150 J of energy is incident on area 2 m2. If Qr =15 J, coefficient of absorption is 0.6, then amount of energy transmitted is
  • 50 J
  • 45 J
  • 40 J
  • 30 J
The refractive index and the permeability of a medium are 1.5 Hm- 1 and 5 × 10-7 Hm -1 respectively. The relative permittivity of the medium is nearly
  • 25
  • 15
  • 81
  • 10
  • 6
The sun delivers 103 Wm-2 of electromagnetic flux on the earth's surface. The total power that is incident on a roof of dimensions 6 m × 30 m, is
  • 1.8 × 105 W
  • 7.2 × 105 W
  • 0.9 × 105 W
  • 4.5 × 105 W
A plane EM wave travels in free space along X-axis. At a particular point in space, the electric field along Y-axis is 9.3 Vm -1. The magnetic induction is
  • 3.1 × 10-8 T
  • 3 × 10-5 T
  • 3 × 10-6 T
  • 9.3 × 10-6 T
  • 3.1 × 10-7 T
Radiations of intensity 0.5 Wm -2 are striking a metal plate. The pressure on the plate is
  • 0.166 × 10-8 Nm-2
  • 0.332 × 10-8 Nm-2
  • 0.111 × 10-8 Nm-2
  • 0.083 × 10-8 Nm-2
For EM wave propagating along X-axis, Emax = 30 Vm -1. What is maximum value of magnetic field?
  • 10-7 T
  • 10-8 T
  • 10-9 T
  • 10-6 T
A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is

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  • 2)
    Physics-Electromagnetic Waves-69769.png

  • Physics-Electromagnetic Waves-69770.png

  • Physics-Electromagnetic Waves-69771.png
The rms value of the electric field of the light coming from the sun is 720 NC -1. The average total energy density of the electromagnetic wave is
  • 4.58 × 10-6 Jm-3
  • 6.37 × 10-9 Jm-3
  • 81.35 × 10-12 Jm-3
  • 3.3 × 10-3 Jm-3
A perfectly reflecting mirror has an area of 1 cm2. Light energy is allowed to fall on it for 1 h at the rate of 10 Wcm-2. The force that acts on the mirror is
  • 3.35 × 10-8 N
  • 6.7 × 10-8 N
  • 1.34 × 10-7 N
  • 2.4 × 10-4 N
A parallel plate capacitor is charged to 60 µC. Due to a radioactive source, the plate loses charge at the rate of 1.8 × 10 -8 Cs-1. The magnitude of displacement current is
  • 1.8 × 10-8 Cs-1
  • 3.6 × 10-8 Cs-1
  • 4.1 × 10-11 Cs-1
  • 5.7 × 10-12 Cs-1
If ε0 and µ0 are the electric permittivity and magnetic permeability of free space and ε and µ are the corresponding quantities in the medium, the index of refraction of the medium in terms of above parameter is

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  • 2)
    Physics-Electromagnetic Waves-69777.png

  • Physics-Electromagnetic Waves-69778.png

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Light wave is travelling along y-direction. If the corresponding E vector at any time is along the x-axis, the direction of B vector at that time is along
Physics-Electromagnetic Waves-69781.png
  • y – axis
  • x – axis
  • +z – axis
  • –z – axis
In fog, photographs of the objects taken with infrared radiations are more clear than those obtained during visible light because
  • IR radiation has lesser wavelength than visible radiation
  • scattering of IR light is more than visible light
  • the intensity of IR light from the object is less
  • scattering of IR light is less than visible light
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