Light and Waves What causes a wave disturbance?

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Presentation transcript:

Light and Waves What causes a wave disturbance? What is the source of electromagnetic waves? What is a photon? Is a photon best described as particle or wave?

Light and Waves What is the speed of light in a vacuum? How fast can light travel around the earth? How long does it take light to reach earth from the Sun?

Light and Waves What are the frequencies of light and how do they compare? Which frequencies have the shortest wavelength? The longest? Which frequencies have the most energy? The least?

λ is the wavelength- the distance from crest to crest on a wave Light and Waves C = λf The frequency (f) of a wave is the number of waves to cross a point in 1 second (units are Hertz – cycles/sec or sec-1) λ is the wavelength- the distance from crest to crest on a wave

Light and Waves What is transparent / opaque ? What is the difference between a longitudinal and transverse wave? What is propagated in a wave?

Light and Waves

What is constructive interference? Destructive interference? Light and Waves What is constructive interference? Destructive interference?

Light and Waves

Color Addition Primary Colors Red – Blue - Green Adding Red + Blue = Magenta Adding Red +Green = Yellow Adding Blue + Green = Cyan Adding Red + Green + Blue = White

Magenta + Cyan + Yellow removes all primary colors = Black Color Subtraction Primary Pigments Secondary Pigments Magenta – Yellow – Cyan Cyan removes Red Magenta removes Green Yellow removes Blue Magenta + Cyan + Yellow removes all primary colors = Black

Color Subtraction Color Rays 1 1 2 Blue Yellow Cyan