Electromagnetic Waves Lesson 1
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Questions and Answers

What is the speed of electromagnetic waves in a vacuum?

  • 1x10^8 ms⁻¹
  • 2x10^8 ms⁻¹
  • 4x10^8 ms⁻¹
  • 3x10^8 ms⁻¹ (correct)

    • What is the characteristic of electromagnetic waves that allows them to travel through a medium?

  • They do not require a medium (correct)
  • They are longitudinal waves
  • They require a medium
  • They have a neutral charge

    • Which type of electromagnetic wave has the longest wavelength and lowest frequency?

  • Microwaves
  • Visible light
  • Infrared rays
  • Radio waves (correct)

    • What is the relationship between frequency and energy of electromagnetic waves?

    <p>The higher the frequency, the higher the energy</p> Signup and view all the answers

    What is the characteristic of ultraviolet rays that makes them useful for killing bacteria?

    <p>They carry more energy than visible light</p> Signup and view all the answers

    What is the characteristic of X-rays that allows them to penetrate most matter?

    <p>They carry a great amount of energy</p> Signup and view all the answers

    What is the highest point in a wave?

    <p>Crest</p> Signup and view all the answers

    What is the lowest point in a wave?

    <p>Trough</p> Signup and view all the answers

    What is the energy carried by the wave shown by?

    <p>Amplitude</p> Signup and view all the answers

    What is the point from one crest to another crest or one trough to another trough?

    <p>Wavelength</p> Signup and view all the answers

    What is the term used for the X axis in waves?

    <p>Time axis</p> Signup and view all the answers

    What is the relationship between wavelength, frequency, and energy of an electromagnetic wave?

    <p>Longer wavelength means lower frequency and lower energy</p> Signup and view all the answers

    What is the term for the highest point in a wave?

    <p>Crest</p> Signup and view all the answers

    What represents the energy carried by a wave?

    <p>Amplitude</p> Signup and view all the answers

    What is the term for the distance from one crest to another crest or one trough to another trough?

    <p>Wavelength</p> Signup and view all the answers

    What is the term for the X-axis in waves?

    <p>Line of origin</p> Signup and view all the answers

    What is the result of a changing electric field?

    <p>Production of magnetic field</p> Signup and view all the answers

    What is unique about the way electromagnetic waves travel?

    <p>They can travel through a vacuum</p> Signup and view all the answers

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