electromagnetic waves and uses of EM waves

• What type of waves are all EM waves?

  Transverse waves
• How do hot objects transfer energy?

  By emitting infrared radiation
• Do all EM waves travel at the same speed in a vacuum?

  Yes
• What forms a continuous spectrum of EM waves?

  A range of frequencies
• What are the seven basic bands of EM waves?

  • Radio Waves
  • Micro Waves
  • Infrared
  • Visible Light
  • Ultra Violet
  • X-Rays
  • Gamma Rays
• What is the wavelength range for radio waves?

  10³m to 2m
• What is the wavelength range for gamma rays?

  10^-12m
• Why can the human eye only detect visible light?

  It can only see a tiny part of the spectrum
• What generates a large range of frequencies in EM waves?

  Changes in atoms and their nuclei
• What type of radiation is created by changes in the nucleus of an atom?

  Gamma rays
• How do EM waves travel in different materials?

  At different speeds, causing refraction
• Why are different EM waves used for different purposes?

  Because of their different properties
• What are EM waves made of?

  Oscillating electric and magnetic fields
• What produces oscillating electric and magnetic fields?

  Oscillating charges in alternating currents
• What is the frequency of the waves produced by an alternating current?

  Equal to the frequency of the current
• How can you produce radio waves?

  Using an alternating current in a circuit
• What is the object called that creates radio waves?

  Transmitter
• What happens when radio waves reach a receiver?

  They are absorbed by the receiver
• What does the energy from absorbed radio waves do to electrons?

  Causes them to oscillate
• What happens if the receiver is part of a complete electrical circuit?

  It generates an alternating current
• What is the frequency of the current generated in the receiver?

  Same as the radio waves
• What is the process of radio wave transmission and reception?

  1. Transmitter creates radio waves via oscillating charges.
  2. Radio waves travel and reach the receiver.
  3. Receiver absorbs radio waves.
  4. Energy causes electrons to oscillate.
  5. If in a circuit, an alternating current is generated.