Writing Prompt: 11/6/06 l ANSWER IN COMPLETE SENTENCES! l How does water move to make a wave? l How does a wave travel? Waves Not just for beaches anymore… Waves l Definition: A disturbance that propagates, carrying energy. l MOST waves need a medium to travel through (i.e. air, water, etc.) Waves l Electromagnetic waves (light) DO NOT need a medium to travel in l This is why light can travel through space, where there is no air. Waves l Different parts of a wave: l Crest: highest point l Trough: lowest point l Amplitude: the height of the wave l Wavelength: the length of 1 wave from crest to crest Waves l Different parts of a wave: l Crest l Trough l Amplitude l Wavelength Waves l Wave Properties: l Wave speed: time it takes a wave to move a certain distance (distance / time) l Frequency: the # of waves that pass in a second (unit is call a Hertz or Hz) Waves l Different Types of Waves: l Periodic:a wave that moves back/forth l Standing wave: a wave that only rises or falls l Transverse wave: a wave that has a crest and trough (moves up and down) l Compression/Longitudinal wave: a wave that moves in and out but not up and down. Waves l DEMO l What types of waves are these? Waves l ACTIVITY TIME!
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