Radiowaves

• What are radio waves part of?

  The electromagnetic spectrum
• What is the wavelength and frequency of radio waves compared to other electromagnetic waves?

  They have the longest wavelength and lowest frequency
• What generates radio waves?

  Oscillating electric and magnetic fields
• How are radio waves generated?

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

  A transmitter
• What does an oscilloscope do in the context of radio waves?

  It shows the frequency of the alternating current
• Why is frequency important in generating radio waves?

  It determines the frequency of the produced wave
• What device is used to detect radio waves?

  A receiver
• How does a receiver work with radio waves?

  It absorbs energy and generates an alternating current
• What is the relationship between the frequencies of the generated and received waves?

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

  By generating a wave at 800 hertz
• What are the main uses of radio waves?

  • Communication
  • Transmitting data
  • Broadcasting audio and video
• What are the three types of radio waves?

  1. Long wave
  2. Short wave
  3. Very short wave
• How far can long wave radio waves be transmitted?

  Huge distances, like London to Singapore
• Why can long wave radio waves travel such long distances?

  They diffract around the Earth's surface
• How do short wave radio signals travel long distances?

  They are reflected from the ionosphere
• What is one use of short wave radio signals besides long-distance communication?

  Sending data over short distances like Bluetooth
• What are very short radio waves used for?

  TV and FM radio
• Why might you not get a good radio signal in a car?

  Surrounding structures can block direct transmission
• What is the basic method of transferring information using radio waves?

  • Generate a wave at a specific frequency
  • Use a receiver to interpret the frequency
  • Transfer various types of information