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-       Sound waves exist as longitudinal waves – the vibrations of the air particles are in the same direction as the wave

-       Light waves- the vibrations are at right angles to the direction of wave

-       The distance between two rises on a wavelength is the same as the distance between two consecutive troughs

-       At a different wavelength the light wave changes

-       Visible light - change of wavelength is seen as different colors

Light waves have different wavelengths and different frequencies

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-       Electromagnetic spectrum - energy that provides music (radio), pictures on TV & heat to cook in a microwave

-       We only see a small amount of this light energy

-       Different types of light have common features

-       Similarities: All travel the same speed - the speed of light

-       Differences: wavelengths and frequencies

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300 000 km/s

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the particle moves back and forth in the same direction as the wave, as the vibration passes through the air.

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= louder to our ears

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-       Light is a form of energy

-       Behaves like waves

-       Different types of light vary in wavelength

-       These form of lights: electromagnetic spectrum

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- plastic
- rubber
- wood

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- copper
- all metals

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Amplitude is the distance the air particle moves.

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more movement = more amplitude

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Transparent: allowing light to pass through so that objects behind can be distinctly seen. Example – window

Translucent: allowing light, but not detailed shapes, to pass through; semi-transparent. Example – frosted window
Opaque: not able to be seen through; not transparent. Example – Brick

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Sound waves travel as LONGITUDINAL waves

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material that does not allow the movement of charged particles

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material through which charged particles are able to move

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convection occurs due to bulk molecule movement.  Convection takes place through advection, diffusion or both.  Convection cannot take place in most solids because neither bulk current flows nor significant diffusion of matter can take place

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like charges repel
unlike charges attract

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made up of; COMPRESSION S and REFRACTION

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term related to the presence and flow of electric charge

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- sound is caused by the vibration of particles moving in a wavelike motion.