physics unit 1- electromagnetic waves

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  • electromagnetic waves move energy from place to place
  • ALL ELECTROMAGNETIC WAVES TRAVEL THROUGH A VACUUM AT THE SAME PACE BUT HAVE DIFFERENT WAVE LENGTHS AND FREQUENCIES
  • we group the electromagnetic spectrum on wave length and frequency
  • RADIO-->MICROWAVES-->INFRARED RADIATION-->VISIBLE LIGHT-->ULTRA VIOLET-->XRAYS-->GAMMA RAYS
  • radio waves- highest wavelength but lowest frequency
  • gamma rays- shortest wavelength but highest frequency
  • different wave lengths of the spectrum are relfected, absorbed transmitted differently by different surfaces and substances
  • higher frequecy=more energy
  • visible light is detected by our eyes, we see the different wave lengths as different colours
  • all the colours= white light
  • remote controls use infrared radiation
  • microwaves-satallite signal in mobile networks
  • radio waves- tv and radio
  • microwaves and radio waves are bad because they penetrate your skin and are absorbed by tissue which can heat organs
  • infrared can burn your skin and…

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