Sunday, October 18, 2009

Physical Science Waves

Electromagnetic Waves- electric and magnetic field that are perpendicular to each other.

  • transverse waves
  • do not need a medium
  • light is a EM wave
  • light is a combination of a wave and particle
  • photon- packet of energy/ particle that carries energy.
  • waves will travel as long as there is energy to carry
wave speed = frequency x wavelength
  • wave speed (ws) is measured in m/s
  • frequency (f) is measured in hertz
  • wavelength is measured in meters
  • the speed of a light wave is a constant in a vacuum (symbol "c") is 300.000 km/s
  • speed of a EM wave will decrease as it enters a more dense medium
  • the higher frequency EM waves will have short wavelengths, low frequency will have longer wavelengths.
  • gamma rays have the the shortest wavelength/ highest frequency.
  • EM spectrum ( low frequency to high)- radio, infrared, visible, x-ray, gamma.

No comments: