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What is Light?

What is Light?. What Is Light?. Energy!. Energy…. Usually needs a medium for transmission. Ex. Heat transfers by convection or conduction. Light Energy…. Travels through the vacuum of outer space….. Transferred by radiation in the form of an electromagnetic wave.

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What is Light?

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  1. What is Light?

  2. What Is Light? Energy!

  3. Energy…. • Usually needs a medium for transmission. • Ex. Heat transfers by convection or conduction.

  4. Light Energy….. • Travels through the vacuum of outer space….. • Transferred by radiation in the form of an electromagnetic wave

  5. Properties of Light • Travels in straight lines. • Travels VERY fast. - travel at a speed of 3.00 X 108 m/s

  6. An electromagnetic wave is a wave of energy that moves through space Electromagnetic Waves

  7. Different electromagnetic waves have different lengths which give them different amounts of energy

  8. Electromagnetic Spectrum

  9. Electromagnetic Spectrum • Gamma rays • X-rays • Ultraviolet light • Visible light • Infrared light • Microwaves • Radio waves (pg. 466)

  10. But we don’t see radio waves and x-rays…..

  11. Our ears can not hear some high sound frequencies that dogs can. Similarly our eyes can not “see” some of the wavelengths of light.

  12. Visible Light! • Any electromagnetic wave that the human eye can detect. • Called theVisible Spectrum.

  13. - white light breaks into the colours of a rainbowwhen it passes through a prism.- white light is made of all the colours of the visible spectrum

  14. Similarly…. • A rainbow appears in the sky from the sun’s rays.

  15. So….when light from the sun is broken down, its’ spectrum looks like The sun’s light is therefore White Light.

  16. When light from some sources is broken down, it’s Spectrum looks like a series of lines.

  17. The Visible LightSpectrum is a very small part of a much larger spectrum called the Electromagnetic Spectrum

  18. How Do You Remember the Colours? • All the colours spell the name Roy G Biv (but that’s boring!)

  19. Words to remember the Electromagnetic Spectrum from Long to Short Wavelength

  20. Las Vegas Light Show

  21. What is BLACK Light? • A lamp that emits electromagnetic radiation almost exclusively in the soft near ultraviolet range. • Only a very small fraction of visible radiation is emitted, and it is seen as violet/blue light!

  22. Playing with Light! • Ray box • 2 prisms • Draw what you see under the light rays!

  23. Vocabulary! Medium, Convection, Conduction Radiation Electromagnetic Wave Electromagnetic Spectrum Visible Light Prism

  24. Homework! Pg. 469 # 2 - 9

  25. Newton noted that the individual coloured lines could not be separated further. These lines are pure colours and are identified by a frequency and wavelength number.

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