Electromagnetic Spectrum

—This spectrum is broad and covers a wide range of various waves.

—We can only see a tiny portion of the wave and that is our COLOURS.

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What exactly is an electromagnetic wave?

Happens when an electric field couples with a magnetic field. The two fields run perpendicular with each other

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—Where do we see or find it?

  • Turn on the radio
  • Hey our cell phone is wireless? How?
  • Wireless internet? Really? How?
  • Microwave dinners are cooked without anything touching it? How?

—Wavelength

  • The distance over which the wave’s shape repeats itself
  • Wavelength is represented by λ lambda
  • Since waves are so short, they are measured in nanometres, or metres x 10-9
  • 350nm is 350 x 10-9 m

—Frequency

  • How many wavelengths get passed through per time (unit)
  • Expressed in hertz (hz) or s-1 and denoted by v (Greek letter “nu”)

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The longer the wavelength, the smaller the frequency, the lower the energy.

Wavelength is inversely proportional to frequency and energy. The longer the wavelength, the small the frequency and energy.