WAVES UNIT WAVES UNIT SWBAT COMPARE WAVES AND

WAVES UNIT

WAVES UNIT: SWBAT COMPARE WAVES AND LABEL PARTS OF A WAVE DEFINITION A disturbance that transfers energy from one place to another Characteristics Matter moves in place, energy travels the entire distance WAVE Examples water waves Sound waves Non example Ball rolling Waterfall consolo '12, OBJ: swbat label a wave and compare waves

definition characteristics Waves that transfer energy through medium Forces start the disturbance and send it through the medium; the particles of the medium vibrate Mechanical wave Non examples Seismic wave in an earthquake Sounds of church bells Ocean waves consolo '12, OBJ: swbat label a wave and compare waves Microwave Light waves

The following are various types of mediums. Let’s identify the type of wave would use the medium. Water: Rocks and soil: Air: When a wave starts-what moves from the beginning to the end of the wave? energy Why doesn’t the ocean empty when the waves reach the shore? Because the waves are transferring energy NOT matter! Electromagnetic waves like light do not require a medium to transfer energy. They use electric and magnetic fields. consolo '12, OBJ: swbat label a wave and compare waves

This wave moves perpendicular/at right angles to the force. The force moves up and down causing the wave medium to move in an up and down motion. Example: ocean waves or light waves crests wavelength consolo '12, OBJ: swbat label a wave and compare waves

Longitudinal Waves The motion of the particles and the medium is back and forth Compressions: where the particles bunch up together. Rarefaction: places where the particles spread out consolo '12, OBJ: swbat label a wave and compare waves

Review: TRANSVERSE WAVE crest wavelength trough amplitude consolo '12, OBJ: swbat label a wave and compare waves

How are frequency and wave length related 1. 2 Frequency: Number of wave lengths that pass a certain point Wavelength: Distance from one crest, or trough to the next When the frequency increases, the wavelength decreases. http: //www. youtube. com/watch? v=V 87 VXA 6 g. Pu. E&feature=related http: //www. youtube. com/watch? v=1 M 8 ci. WSgc_k&feature=related consolo '12, OBJ: swbat label a wave and compare waves

Reflection The bouncing back of a wave after it strikes a barrier Refraction Bending of a wave as it enters a medium other than 90 deg Diffraction Spreading out of waves through opening or past obstacle consolo '12, OBJ: swbat label a wave and compare waves Interference The meeting and combining of waves

Interference of waves Constructive interference is the building up of waves when two waves align exactly, and thus the amplitudes are added together resulting in a bigger wave. So if two waves met and the first had an amplitude of 2 and the second an amplitude of 2 then at the crest where they met the new waves amplitude would be 4. after merging they then return to their original directions and amplitudes. consolo '12, OBJ: swbat label a wave and compare waves