Electromagnetic Waves Questions! Trivia Quiz

14 Questions | Total Attempts: 467

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Electromagnetic Waves Questions! Trivia Quiz


Questions and Answers
  • 1. 
    The electric field intensity produced by the radiations coming from 100 W bulb at a 3 m distance is E. the electric field intensity produced by the radiations coming from 50 W bulb at the same distance is
    • A. 
    • B. 
    • C. 
    • D. 
  • 2. 
    One requires 11eV of energy to dissociate a carbon monoxide molecule into carbon and oxygen atoms. The minimum frequency of the appropriate electromagnetic radiation to achieve the dissociation lies in
    • A. 

      Visible region

    • B. 

      Infrared region

    • C. 

      Ultraviolet region

    • D. 

      Microwave region

  • 3. 
    The electric and magnetic field of an electromagnetic wave are
    • A. 

      In opposite phase and perpendicular to each other

    • B. 

      In opposite phase and parallel to each other

    • C. 

      In phase and perpendicular to each other

    • D. 

      In phase and parallel to each other

  • 4. 
    The velocity of electromagnetic radiation in a medium of permittivity ∈0 and permeability μ0 is given by
    • A. 
    • B. 
    • C. 
    • D. 
  • 5. 
    The electric and the magnetic field, associated with an e.m. wave, propagating along the +z-axis, can be represented by
    • A. 
    • B. 
    • C. 
    • D. 
  • 6. 
    If μ0 be the permeability and k0, the dielectric constant of a medium, its refractive index is given by
    • A. 
    • B. 
    • C. 
    • D. 
  • 7. 
    The amplitude of an electromagnetic wave in the vacuum is doubled with no other changes made to the wave. As a result of this doubling of the amplitude, which of the following statement is correct?
    • A. 

      The speed of wave propagation changes only

    • B. 

      The frequency of the wave changes only

    • C. 

      The wavelength of the wave changes only

    • D. 

      None of the above is true

  • 8. 
    If a 100-watt bulb acts as a point source and has 2.5% efficiency, the intensity of this bulb at 3 m is
    • A. 

      0.022 Wm-2

    • B. 

      0.22 Wm-2

    • C. 

      4.4 Wm-2

    • D. 

      0.033 Wm-2

  • 9. 
    A plane electromagnetic wave is an incident on a material surface. The wave delivers momentum p and energy E. Then
    • A. 

      P ≠ 0, E ≠ 0

    • B. 

      P = 0, E = 0

    • C. 

      P = 0, E ≠ 0

    • D. 

      P ≠ 0, E = 0

  • 10. 
    When a plane electromagnetic wave travels in a vacuum, the average electric energy density is given by (here Eo is the amplitude of the electric field of the wave)
    • A. 
    • B. 
    • C. 
    • D. 
  • 11. 
    The frequencies of X-rays, γ-rays and ultraviolet rays are respectively a, b and c. Then
    • A. 

      A < b, b > c

    • B. 

      A > b, b > c

    • C. 

      A > b, b < c

    • D. 

      A < b, b < c

  • 12. 
    Poynting vector gives
    • A. 

      The magnetic field at a point due to a current in a straight conductor

    • B. 

      The electric field at a point between the plates of a parallel plate capacitor

    • C. 

      The rate of flow of energy perpendicular to direction of motion through unit area in an electromagnetic field

    • D. 

      Total energy of electromagnetic wave

  • 13. 
    The frequency of e.m. wave which is best suited to observe a particle of radius 3 × 10-1 cm is of the order of
    • A. 

      1015 Hz

    • B. 

      1014 Hz

    • C. 

      1013 Hz

    • D. 

      1012 Hz

  • 14. 
    The magnetic field in a plane electromagnetic wave is given by By = 2 × 10-7 sin (0.5 × 103 x + 1.5 × 1011 t). This electromagnetic wave is
    • A. 

      A visible light

    • B. 

      An infrared wave

    • C. 

      A microwave

    • D. 

      A radiowave

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