6.2.2 Properties of Electromagnetic Waves

• Electromagnetic waves can travel through a vacuum.


  True
• Electromagnetic waves require a medium to travel.

  False
• The magnetic field oscillates perpendicular to both the electric field and the direction of wave propagation.

  True
• The speed of light is the same as the speed of electromagnetic waves in a vacuum.


  True
• Electromagnetic waves travel at the speed of light in a vacuum.


  True
• Electromagnetic waves are formed by vibrating electric and magnetic fields
• The electric field in an electromagnetic wave oscillates perpendicular to the direction of propagation
• What symbol represents the speed of electromagnetic waves in a vacuum?

  c
• What is the primary difference between electromagnetic and mechanical waves in terms of their propagation?

  Medium requirement
• Electromagnetic waves are a type of transverse wave.
• In electromagnetic waves, the oscillation of the electric and magnetic fields is perpendicular to the direction of wave travel.
• The perpendicular arrangement of electric and magnetic fields allows electromagnetic waves to propagate through a vacuum.
• What is the relationship between speed, wavelength, and frequency of an electromagnetic wave?

  $c =$$λf$
• What happens to the speed of electromagnetic waves when they enter a material?

  It decreases
• Electromagnetic waves are longitudinal waves.

  False
• The magnetic field in an electromagnetic wave oscillates parallel to the electric field.

  False
• The speed of electromagnetic waves in a vacuum is approximately $3.0 \times 10^{8} \text{ m / s}$.


  True
• What happens to the speed of electromagnetic waves when they enter a material medium?

  It decreases
• Mechanical waves involve particle oscillations that can be either parallel or perpendicular to the direction of propagation
• What are electromagnetic waves formed by?

  Vibrating electric and magnetic fields
• Which fields are involved in electromagnetic waves?

  Electric and magnetic
• In which direction does the electric field oscillate in electromagnetic waves?

  Perpendicular to wave propagation
• What is the speed of electromagnetic waves in a vacuum?

  $3.0 \times 10^{8} \text{ m / s}$
• Order the types of electromagnetic waves from longest to shortest wavelength:

  1️⃣ Radio waves

  2️⃣ Microwaves

  3️⃣ Infrared

  4️⃣ Visible light

  5️⃣ Ultraviolet

  6️⃣ X-rays

  7️⃣ Gamma rays
• What is unique about electromagnetic waves compared to mechanical waves in terms of their medium requirement?

  They can travel through a vacuum
• Why are electromagnetic waves able to travel through a vacuum?

  No physical medium is required
• In what direction does the electric field oscillate in relation to the wave propagation of an electromagnetic wave?

  Perpendicular
• The relationship between the speed, wavelength, and frequency of an electromagnetic wave is given by $c =$$\lambda f$.frequency
• When electromagnetic waves travel through a material, their frequency remains constant.


  True