Light is energy and travels like a wave

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Light is energy and travels like a wave
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Electromagnetic Spectrum

• All energy on our planet comes from the Sun
• The Sun emits more types of energy than just
  visible light

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Electromagnetic Spectrum

• The main difference between these types of energy
  is their wavelengths
• A wavelength is the distance between two crests
  of the wave

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Electromagnetic Spectrum

• These waves differ in the distance between the
  crests
• If the crests are far apart the energy level is
  low, for example radio waves, cell phone waves

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Electromagnetic Spectrum

• If the crests are close together the energy level
  is much higher, for example X-rays and gamma rays
• These types of waves are more dangerous to living
  organisms

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The energy carried by the waves is kinetic energy
(the energy of motion) and we can harness this
energy to make something happen.
Even though we cant see most of these waves we
use their energy to run our TVs, cell phones,
radios, microwaves, take X-rays etc.
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We can only see a small portion of the
electromagnetic spectrum - the part that is
visible light
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Visible light

• When you see a rainbow in the sky, or the
  spectrum split by a crystal (prism) you are
  seeing the wavelengths of visible light
• We name these parts of visible light using their
  colours

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The colours of the rainbow, or visible light are

• Red
• Orange
• Yellow
• Green
• Blue
• Indigo
• Violet

Roy G Biv