Waves! ________: are vibrations in space over time that carry ________ from one place to another. A ________ swinging back and forth on a string shows simple _______ motion. This creates a _____ curve. A wave in the shape of this type of curve is called a _________ wave. λ (_______)=___________ = the length of one complete wave. Unit: _____ f = ________ = the number of complete waves in one second Unit: _______ T = ______ = “once” the time of one complete wave Unit: ____. a)3 ocean waves pass your boat in 15 seconds. What is the period of the ocean waves? b) What is the frequency of the ocean waves? c) If the distance between the crests is 4 m, what is the velocity of the waves? Types of Waves: 2 wave shapes: _________ waves: the ________ vibrates perpendicular to the wave. (Rope wiggles up and down, wave travels along) Ex: _____________ waves like light and radio waves. ________ waves: the _______ vibrates ________ to the wave. (Slinky swishes back and forth, waves travel along.) Ex: ________ waves. 2 wave methods: 1) With or 2) without a _______, which is the matter in which waves travel. Mechanical waves must vibrate matter  water, air, rope, etc. Electromagnetic (like light) waves are waves in electric and magnetic fields, which are not made of matter: no medium required. Interference: waves can overlap and form an interference _______. 2 types: 1)________ interference: adds together the ________ (tops) of the waves and makes bigger waves  higher _______. 2)_________ interference: cancels a _______ with a _______ and makes smaller waves  lower _________. _______ waves are waves that look like they stand still, because the incident (starting) waves and reflected waves interfere with each other. Ex: guitar string The ________ effect is when it seems like the frequency (pitch for sound or color for light) is changing when the source is moving. Ex: Cars that drive by with the zee-yoom sound.

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