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.

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Presentation transcript:

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 Examples water waves Sound waves Non example Ball rolling Waterfall WAVE consolo '12, OBJ: swbat label a wave and compare waves

medium definition ANY SUBSTANCE OR MATTER A WAVE MOVES THROUGH CHARACTERISTICS EXAMPLES NON EXAMPLES GASES, SOLIDS, LIQUIDS WATER AIR OXYGEN LIGHT consolo '12, OBJ: swbat label a wave and compare waves

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

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

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

consolo '12, OBJ: swbat label a wave and compare waves How are frequency and wave length related 1.2 Frequency: Wavelength: Number of wave lengths that pass a certain point Distance from one crest, or trough to the next When the frequency increases, the wavelength decreases.

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

consolo '12, OBJ: swbat label a wave and compare 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.