Light - A kind of energy also called electromagnetic radiation. Light travels in straight lines. We see things when light hits an object, is reflected, and enters our eyes., Sound - What is heard when sound waves pass through a medium to the ear. All sounds are made by vibrations of molecules., Natural Light - Light that comes from the sun or a natural substance., Artificial Light - Light that does not come from the sun. It comes from sources such as light bulbs, fires, or other human made fixtures., Pitch - The quality that allows us to classify a sound as 'high' or 'low'. Pitch is determined by the frequency of sound wave vibrations. , Loudness - At attribute of a sound. The loudness of a sound wave depends on its energy. The greater the energy the louder the sound., Vibration - The action of moving or causing to move back and forth or from side to side very quickly., Device - A thing made or adapted for a particular purpose, such as a piece of mechanical or electronic equipment. , Property - A characteristic or quality that something has such as a colour, ability to reflect, refract or absorb., Absorption - The taking up and storing of energy, such as light or sound, without it being reflected or transmitted., Reflection - Occurs when light bounces off an object., Refraction - The bending of a light or sound wave as it passes from one substance into another., Diffraction - The bending of waves as they pass small obstacles and the spreading out of waves after passing through small openings., Opaque - A characteristic of a substance that does not allow light to pass through it., Transparent - A characteristic of a substance that allows light to pass through without scattering. , Translucent - A characteristic of a substance that allows light to pass through but will cause the light to scatter. , Emit - To give out light or sound., Sound wave - A wave that is formed when a sound is made and that moves through the air and carries the sound to your ear., Light wave - A form of moving energy that is visible.,

Light & Sound Grade 4

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