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Properties of Light

Properties of Light. The Sun. The sun is a star (made of plasma). Many explosions happen on the sun (like atomic bombs) that create energy. This energy (called radiation ) travels in all directions. How Does Energy Travel?. Energy travels in waves (like water).

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Properties of Light

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  1. Properties of Light

  2. The Sun • The sun is a star (made of plasma). • Many explosions happen on the sun (like atomic bombs) that create energy. • This energy (called radiation) travels in all directions.

  3. How Does Energy Travel? • Energy travels in waves (like water). • The close waves are STRONG. • Waves that are far away are WEAK.

  4. Which Side is Stronger: Left or Right?

  5. Electromagnetic Radiation • The sun is so powerful that it creates 7 different kinds of radiation. • Some of this radiation is strong (waves close together); some of it is weak (waves far apart). • All the different kinds of radiation is organized in an Electromagnetic Spectrum.

  6. Electromagnetic Spectrum • There are 7 kinds of radiation in the electromagnetic spectrum: • Radiowaves, Microwaves, Infrared Radiation, Visible Light, Ultraviolet Radiation, X-Rays, and Gamma Rays.

  7. The Electromagnetic Spectrum • Radiowaves – weak waves that give your radio or TV the energy to work. (can you see them?) • Microwaves - weak waves that can cook your food or used for cell phones and radar. (can you see them?) • Infrared Radiation – weak waves coming from something that is hot. (can you see them?) • Visible Light – the only radiation you can see.

  8. Continued… • Ultraviolet Radiation – strong radiation that can make you tan and get cancer. (Can you see them?) • X-Rays – dangerous radiation that can go through to your bones. (can you see them?) • Gamma rays - the most powerful radiation. Very dangerous. Found in a nuclear explosion.

  9. Visible Light • Humans can only see visible light. • Visible light is made up of all of the colors of the rainbow: • Red • Orange • Yellow • Green • Blue • Indigo • Violet

  10. How visible light travels… • Visible Light travels in waves… • BUT, the waves are so small that from far away it looks like a straight line. • SO…from now on we will ONLY say that light travels in a straight line.

  11. Light Does 4 Things When it Hits an Object: • Reflection • Transmittance • Absorption • Refraction

  12. The 2 Angles in a Reflection

  13. How are the 2 angles related? • The angle of incidence and the angle of reflection are ALWAYS the same!!!

  14. Colors

  15. Remember: • The colors of the rainbow are: • Red, Orange, Yellow, Green, Blue, Indigo, and Violet. • All the colors of the rainbow are ROY G. BIV.

  16. Prisms • What did you notice when the light hit the prisms??? • The reason a rainbow appeared is because the light was... REFRACTED.

  17. Visible Light • Each color of the rainbow has a different size wave. • Some colors are stronger than others • Red is weakest • Violet is strongest.

  18. Visible Light • What does this say about white light (visible light)? • VISIBLE LIGHT (white light) IS MADE UP OF ALL COLORS OF THE RAINBOW!!!!!

  19. Colors • White light is hitting the apple. • Every color of the rainbow is being absorbed by the apple EXCEPT the color red. • The red light that is reflected bounces to your eyes and you see red.

  20. Lenses

  21. Lenses • A lens is a clear object that refracts light so that you can see a bigger version of an object.

  22. LIGHT TEST • The following vocabulary words will appear on your test: • Radiation • Electromagnetic spectrum • Radio waves, Microwaves, Infrared Radiation, Visible Light, Ultraviolet Radiation, X-Rays, Gamma Rays • Reflection, Refraction, Absorption, Transmittance • Angle of Incidence & Angle of Reflection • White Light • ROY G. BIV • Prism • Lens

  23. LIGHT TEST • In order to pass, you must know the following: • What is the electromagnetic spectrum and how much is visible to humans? • How does visible light appear to travel? • What 4 things can happen when visible light hits an object? • How are the angle of incidence and angle of reflection related? • How are humans able to see objects? • Why are objects a certain color? • Which kind of lens would you use to see different sized things?

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