electromagnetic waves

• What is the electromagnetic spectrum?

  It is the range of all electromagnetic waves
• What are electromagnetic waves?

  Transverse waves that transfer energy
• How do microwaves transfer energy?

  From the oven to the food
• What happens when white light passes through a prism?

  It splits into a spectrum of colors
• What part of the electromagnetic spectrum can humans detect?

  Visible light
• How does wavelength and frequency change across the spectrum?

  Wavelength increases, frequency decreases from red to violet
• What is the mnemonic to remember the order of the electromagnetic spectrum?

  Raw meat is very unsanitary except giraffe
• What does it mean that the electromagnetic spectrum is a continuous spectrum?

  There are no clear cutoff points between waves
• Can electromagnetic waves travel through a vacuum?

  Yes, they do not need a medium
• What is the speed of electromagnetic waves in a vacuum?

  $3 \times 10^8 \text{ m/s}$
• How do different materials interact with electromagnetic waves?

  They absorb, transmit, or reflect waves
• Why are microwaves absorbed by food?

  Because they contain water molecules
• How do microwaves interact with metals?

  Microwaves are reflected by metals
• How do light waves interact with black surfaces?

  They are absorbed by black surfaces
• How do light waves interact with shiny metallic surfaces?

  They are reflected from shiny metallic surfaces
• What are the different types of waves in the electromagnetic spectrum in order of wavelength and frequency?

  • Radio waves
  • Microwaves
  • Infrared
  • Visible light
  • Ultraviolet light
  • X-rays
  • Gamma rays
• What are the key properties of electromagnetic waves?

  • Transverse waves
  • Transfer energy
  • Travel through a vacuum
  • Continuous spectrum