uses of EM waves

• What are some uses of electromagnetic waves mentioned in the video?

  • Radio waves for transmitting radio and terrestrial TV signals
  • Microwaves for heating food and satellite communication
  • Infrared for heating and cooking
  • Visible light for communication via fiber optics
  • Ultraviolet for energy-efficient lightbulbs and tanning
  • X-rays and gamma rays for medical imaging and treatments
• What are radio waves used for?

  To transmit radio signals and terrestrial TV signals
• Why are radio waves suitable for transmitting signals over long distances?

  They can travel long distances before being absorbed
• What is diffraction in relation to radio waves?

  It is when longer wavelength radio waves spread out between hills
• What is the ionosphere?

  A layer of charged particles in the atmosphere that reflects radio waves
• How do microwaves heat food?

  Water molecules in food absorb the energy of microwaves
• Why are microwaves suitable for communicating with satellites?

  They can pass through the Earth's atmosphere without being reflected or refracted
• What is infrared used for?

  Heating and cooking food, and in infrared cameras
• How does infrared heating work?

  Infrared energy is absorbed by the surface of objects, warming them
• What is a key use of visible light?

  Communication using fiber optics
• What are optical fibers?

  Very thin strands of glass used to transmit pulses of light
• Why can visible light carry a great deal of information?

  Because it has a short wavelength
• What is a significant use of ultraviolet light?

  In energy-efficient lightbulbs
• How does ultraviolet light contribute to energy-efficient lightbulbs?

  It is absorbed and converted to visible light, requiring less energy
• What is a risk associated with ultraviolet light?

  It increases the risk of skin cancer and causes premature skin aging
• What are x-rays used for?

  Medical imaging to visualize broken bones
• How do x-rays and gamma rays differ in their medical applications?

  1. rays visualize bones, while gamma rays detect cancers
• Why are x-rays absorbed by bones?

  Because bones are denser than surrounding tissues
• How are x-rays and gamma rays used in medical treatments?

  They are used to treat cancer