Radio waves

• What are radio waves a part of?

  The electromagnetic spectrum
• What characteristics do radio waves have compared to other electromagnetic waves?

  They have the longest wavelength and the lowest frequency
• What are radio waves made up of?

  Oscillating electric and magnetic fields
• How can radio waves be generated?

  Using electricity in the form of an alternating current
• What device is used to generate radio waves?

  A transmitter
• What is the purpose of an oscilloscope in generating radio waves?

  To see the frequency of the alternating current
• Why is frequency important in the generation of radio waves?

  It determines the frequency of the wave produced
• How is a radio wave detected after it has been generated?

  Using a receiver that generates another alternating current
• What does the receiver display on another oscilloscope?

  The frequency of the alternating current it produces
• What is the relationship between the frequency of the generated radio wave and the frequency produced by the receiver?

  They are exactly the same
• How can the number 800 be communicated using radio waves?

  By generating a wave with a frequency of 800 hertz
• What is the main use of radio waves?

  For communication
• What are the three types of radio waves you need to know about?

  • Long wave
  • Short wave
  • Very short wave
• What is a key characteristic of long wave radio waves?

  They can be transmitted over huge distances without interaction
• Why can long wave radio waves travel such long distances?

  They diffract or bend around the curved surface of the earth
• How do short wave radio signals travel long distances?

  They are reflected from the ionosphere
• What is the ionosphere?

  An electrically charged layer of the earth's upper atmosphere
• How can shortwave radio be used for short distances?

  It can send data like Bluetooth signals
• What are very short radio waves primarily used for?

  For TV and FM radio
• Why might you not get a great radio signal when in a car?

  Surrounding structures like hills and tunnels can obstruct the signal
• What is the main takeaway from the video?

  Radio waves are used for communication