1. Writing Prompt: 11/6/06 ANSWER IN COMPLETE SENTENCES! ANSWER IN COMPLETE SENTENCES! How does water move to make a wave? How does water move to make a wave? How does a wave travel? How does a wave travel?

2. Waves Not just for beaches anymore…

3. Waves Definition: A disturbance that propagates, carrying energy. Definition: A disturbance that propagates, carrying energy. MOST waves need a medium to travel through (i.e. air, water, etc.) MOST waves need a medium to travel through (i.e. air, water, etc.)

4. Waves Electromagnetic waves (light) DO NOT need a medium to travel in Electromagnetic waves (light) DO NOT need a medium to travel in This is why light can travel through space, where there is no air. This is why light can travel through space, where there is no air.

5. Waves Different parts of a wave: Different parts of a wave: Crest: highest point Crest: highest point Trough: lowest point Trough: lowest point Amplitude: the height of the wave Amplitude: the height of the wave Wavelength: the length of 1 wave from crest to crest Wavelength: the length of 1 wave from crest to crest

6. Waves Different parts of a wave: Different parts of a wave: Crest Crest Trough Trough Amplitude Amplitude Wavelength Wavelength

7. Waves Wave Properties: Wave Properties: Wave speed: time it takes a wave to move a certain distance (distance / time) Wave speed: time it takes a wave to move a certain distance (distance / time) Frequency: the # of waves that pass in a second (unit is call a Hertz or Hz) Frequency: the # of waves that pass in a second (unit is call a Hertz or Hz)

8. Waves Different Types of Waves: Different Types of Waves: Periodic: a wave that moves back/forth Periodic: a wave that moves back/forth Standing wave: a wave that only rises or falls Standing wave: a wave that only rises or falls Transverse wave: a wave that has a crest and trough (moves up and down) Transverse wave: a wave that has a crest and trough (moves up and down) Compression/Longitudinal wave: a wave that moves in and out but not up and down. Compression/Longitudinal wave: a wave that moves in and out but not up and down.

9. Waves DEMO DEMO What types of waves are these? What types of waves are these?

10. Waves ACTIVITY TIME! ACTIVITY TIME!