Chapter 22: Electromagnetic Waves

35 Questions | Total Attempts: 226

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Electromagnetic Wave Quizzes & Trivia

Questions and Answers
  • 1. 
    The basic equations for all electromagnetism were developed by
    • A. 

      Newton.

    • B. 

      Gauss.

    • C. 

      Maxwell.

    • D. 

      Hertz.

  • 2. 
    An electric field is produced by a
    • A. 

      Constant magnetic field.

    • B. 

      Changing magnetic field.

    • C. 

      Either a constant or a changing magnetic field.

    • D. 

      None of the given answers

  • 3. 
    A changing electric field will produce a
    • A. 

      Current.

    • B. 

      Gravitational field.

    • C. 

      Magnetic field.

    • D. 

      None of the given answers

  • 4. 
    All electromagnetic waves travel through a vacuum at
    • A. 

      The same speed.

    • B. 

      Speeds that are proportional to their frequency.

    • C. 

      Speeds that are inversely proportional to their frequency.

    • D. 

      None of the given answers

  • 5. 
    In a vacuum, the velocity of all electromagnetic waves
    • A. 

      Is zero.

    • B. 

      Is nearly 3 * 10^8 m/s.

    • C. 

      Depends on the frequency.

    • D. 

      Depends on their amplitude.

  • 6. 
    Electromagnetic waves can travel through
    • A. 

      Glass.

    • B. 

      Iron.

    • C. 

      Water.

    • D. 

      None of the given answers

  • 7. 
    The strength of both the electric and magnetic fields in the radiation field are found to decrease with distance as
    • A. 

      1/r.

    • B. 

      1/r^2.

    • C. 

      1/r^3.

    • D. 

      1/r^4.

  • 8. 
    The E and B fields in electromagnetic waves are oriented
    • A. 

      Parallel to the wave's direction of travel, as well as to each other.

    • B. 

      Parallel to the waves direction of travel, and perpendicular to each other.

    • C. 

      Perpendicular to the wave's direction of travel, and parallel to each other.

    • D. 

      Perpendicular to the wave's direction of travel, and also to each other.

  • 9. 
    An electromagnetic wave is traveling to the east. At one instant at a given point its E vector points straight up. What is the direction of its B vector?
    • A. 

      North

    • B. 

      Down

    • C. 

      East

    • D. 

      South

  • 10. 
    An electromagnetic wave is radiated by a straight wire antenna that is oriented vertically. What should be the orientation of a straight wire receiving antenna? It should be placed
    • A. 

      Vertically.

    • B. 

      Horizontally and in a direction parallel to the wave's direction of motion.

    • C. 

      Horizontally and in a direction perpendicular to the wave's direction of motion.

    • D. 

      None of the given answers

  • 11. 
    Electromagnetic waves are
    • A. 

      Longitudinal.

    • B. 

      Transverse.

    • C. 

      Both longitudinal and transverse.

    • D. 

      Neither longitudinal or transverse.

  • 12. 
    Of the following, which is not electromagnetic in nature?
    • A. 

      Microwaves

    • B. 

      Gamma rays

    • C. 

      Sound waves

    • D. 

      Radio waves

  • 13. 
    Visible light ranges in wavelength from
    • A. 

      400 μm to 750 μm.

    • B. 

      400 nm to 750 nm.

    • C. 

      500 μm to 850 μm.

    • D. 

      500 nm to 850 nm.

  • 14. 
    The energy an electromagnetic wave transports per unit time per unit area is the
    • A. 

      Energy density.

    • B. 

      Power.

    • C. 

      Intensity.

    • D. 

      Radiation pressure.

  • 15. 
    The force per unit area exerted by an electromagnetic wave is called the
    • A. 

      Energy density.

    • B. 

      Power.

    • C. 

      Intensity.

    • D. 

      Radiation pressure.

  • 16. 
    Which of the following correctly lists electromagnetic waves in order from longest to shortest wavelength?
    • A. 

      Gamma rays, ultraviolet, infrared, microwaves

    • B. 

      Microwaves, ultraviolet, visible light, gamma rays

    • C. 

      Radio waves, infrared, gamma rays, ultraviolet

    • D. 

      Television, infrared, visible light, X-rays

  • 17. 
    If the electric field in an EM wave has a peak value of 2.0 V/m, what is the peak value of the magnetic field?
    • A. 

      6.7 nT

    • B. 

      2.0 T

    • C. 

      3.0 * 10^8 T

    • D. 

      None of the given answers

  • 18. 
    What is the wavelength of light waves if their frequency is 5.0 * 10^14 Hz?
    • A. 

      0.60 m

    • B. 

      6.0 mm

    • C. 

      0.060 mm

    • D. 

      0.60 μm

  • 19. 
    What is the wavelength of a 92.9-MHz radio wave?
    • A. 

      32 mm

    • B. 

      32 cm

    • C. 

      3.2 m

    • D. 

      32 m

  • 20. 
    What is the wavelength of a radio wave signal transmitted at a frequency of 7.2 MHz?
    • A. 

      42 m

    • B. 

      4.2 m

    • C. 

      29 m

    • D. 

      0.024 m

  • 21. 
    What is the wavelength for the carrier wave in the station WBRN 1460?
    • A. 

      2.05 m

    • B. 

      20.5 m

    • C. 

      205 m

    • D. 

      2.05 km

  • 22. 
    What is the frequency of 20 mm microwaves?
    • A. 

      100 MHz

    • B. 

      400 MHz

    • C. 

      15 GHz

    • D. 

      73 GHz

  • 23. 
    How far does light travel in 1.0 μs?
    • A. 

      3.0 * 10^14 m

    • B. 

      0.30 km

    • C. 

      3.0 m

    • D. 

      30 cm

  • 24. 
    How long does it take light to travel 1.0 m?
    • A. 

      3.3 ns

    • B. 

      3.3 μs

    • C. 

      3.3 ms

    • D. 

      3.3 s

  • 25. 
    How long does it take the signal from a local radio station to travel 20 miles?
    • A. 

      2.8 s

    • B. 

      108 ms

    • C. 

      38 ms

    • D. 

      108 ms