Light and sound are forms of energy that behave in predictable ways.
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Light travels and maintains its direction until it interacts with an object or moves from one medium to another and then it can be reflected, refracted or absorbed.
At this grade level, the discussion of light and sound should be based on observable behavior. Waves are introduced at the middle school level.
Sound is produced by vibrating objects and requires a medium through which to travel. The rate of vibration is related to the pitch of the sound.