Electromagnetic waves 1

• What are the learning objectives of the Entry Level Certificate topic?

  To know the uses for radio waves, microwaves, infrared, and visible light
• What is the effective range of Bluetooth signals for data transmission?


  Bluetooth signals can travel a limited distance, typically up to 100 meters
• What are radio waves used for?

  To carry radio, TV, and mobile phone signals
• How do Bluetooth devices communicate?


  Bluetooth devices communicate using radio waves
• What is a key characteristic of microwaves compared to radio waves?

  Microwaves have a shorter wavelength than radio waves
• What are two uses of microwaves?

  For communications and to heat food in microwave ovens
• What do all objects emit?

  Infrared radiation
• How does the amount of infrared radiation emitted by an object change?

  The hotter the object, the more infrared radiation it will emit
• What is one use of infrared radiation?

  Electric heaters use infrared radiation to heat rooms
• What can infrared cameras detect?

  Infrared cameras can detect infrared radiation
• What is the only part of the electromagnetic spectrum that our eyes can detect?

  Visible light
• How do cameras use visible light?

  Cameras use visible light to capture an image
• What is one application of visible light in communications?

  Fibre optic communications use visible light
• What does a rainbow show?

  The colours of the visible light part of the spectrum
• How does light travel in an optical fibre?

  Light is used to transmit a signal in an optical fibre
• Which two parts of the electromagnetic spectrum can be used to cook food?

  Infrared and microwave
• Which type of wave is detected by an aerial of a radio?

  Radio waves
• Which type of wave is emitted from a TV screen?

  Visible light
• Which type of wave carries signals to and from a satellite?

  Microwaves
• What is the typical effective range of Bluetooth signals for data transmission?

  Typically up to 100 meters
• What is the electromagnetic spectrum?

  The range of all types of electromagnetic radiation
• How does infrared radiation function in heating applications?

  Infrared radiation is used to transfer heat to objects
• What is the role of fibre optic cables in communication?

  Fibre optic cables transmit data using light