Light and Color. Electromagnetic Spectrum Tour the electromagnetic spectrum magnetic-spectrum.html

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Presentation transcript:

Light and Color

Electromagnetic Spectrum

Tour the electromagnetic spectrum magnetic-spectrum.html ml

What is the speed of an electromagnetic wave? All waves travel at the speed of light 3 x 10 8 m/s

How does this compare to sound Light travels faster than sound For example fireworks and lightning

Does anything affect the speed? Traveling though different mediums affect speed. In what medium below does speed go the fastest and slowest? A.Air B.Vacuum C.Water

Speed of light through mediums Through a vacuum like space?

Speed of light through medium Through air?

Speed of light through medium Through water?

Why does this happen?

Visible light

How do we remember colors? RoyGBiv video:

Why is the sky blue? Higher frequency light is scattered more easily. The purple end of the visible light reflects off particles in the atmosphere and appear to our eyes.

Speed C = λ f where c = 3 x 10 8 m/s

C is the same for all EM waves Because c is the same, the relationship of λ and f are inversely proportional. As λ goes up f goes down and vice versa

What type of wave is a light wave? Light is an electromagnetic wave and transverse. It is a combination of electric and magnetic fields.

Polarized Light Why do you wear polarized sun glasses?

Polarized lens Demo of lenses

Light transmission through lens Only some light is transmitted through a polarized lens. Transmission-light passing through a medium

When light shines on surfaces Transmission-passing through of light Reflection-light bouncing off Absorption-light not reflecting or transmitting

Light on surfaces

Why do we see color? Color or visible light is the light that is reflected. The color you see is the reflected light, all other colors are absorbed.

Which surface is cooler on a sunny day?

Temperature of surfaces Darker surfaces absorb light and collect their energy and become warm. Light that is transmitted through does not get absorbed and feels cooler.

Light is a wave and particle Why is light a particle? What are the particles in a light wave? Why is light a wave? What characteristics make it behave like a wave?

Double Slit Experiment Wave characteristics: Simulation experiment double slit: MIT student doing double slit: experiment-8432/ Dr. Quantum double slit experiment: 3 Or Ted talks: