uses of EM waves

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

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

  Transmit radio and terrestrial TV signals
• Why are radio waves suitable for transmitting signals?

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

  Spreading out between hills
• What is the ionosphere's role with radio waves?

  Reflects radio waves for long-distance travel
• What is the primary use of microwaves?

  Heating food
• Why do microwaves heat food effectively?

  Water molecules absorb microwave energy
• How do microwaves communicate with satellites?

  They pass through Earth's atmosphere easily
• What is infrared used for?

  Heating and cooking food
• How does infrared heating work?

  Energy is absorbed by surfaces, warming them
• What is a use of infrared cameras?

  Check buildings for heat losses
• What is a key use of visible light?

  Communication using fiber optics
• What are optical fibers made of?

  Thin strands of glass
• Why can visible light carry a lot of information?

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

  Energy-efficient lightbulbs
• How does ultraviolet light work in energy-efficient lightbulbs?

  It is converted to visible light
• What is a risk associated with ultraviolet light?

  Increases skin cancer risk
• What are x-rays used for?

  Visualizing broken bones
• How do x-rays and gamma rays differ in medical use?

  X-rays visualize bones, gamma rays detect cancers
• Why are x-rays absorbed by bones?

  They are very penetrative but bones absorb them
• How are x-rays and gamma rays used in cancer treatment?

  Both can treat cancer effectively