Warm UpWarm Up

If you haven't done the lab with the slinky If you haven't done the lab with the slinky then no warm up. Otherwise...then no warm up. Otherwise...

1. Draw a graph of a standing wave 1. Draw a graph of a standing wave with amplitude vs. position. Label its with amplitude vs. position. Label its amplitude and wavelength.amplitude and wavelength.

WavesWaves

A wave is a disturbance that A wave is a disturbance that transfers energy from a source.transfers energy from a source.

Wave PropertiesWave Properties The The MediumMedium is what the wave is traveling through. is what the wave is traveling through.

Energy moves but the particles of the medium that Energy moves but the particles of the medium that the wave is traveling through do not.the wave is traveling through do not.

AmplitudeAmplitude: height of a wave, shows how much : height of a wave, shows how much energy is being transmitted, can be measured in m energy is being transmitted, can be measured in m or EM Field.or EM Field.

Frequency:Frequency: Measured in hertz (1/s), number of Measured in hertz (1/s), number of wave disturbances per secondwave disturbances per second

VelocityVelocity: speed at which the wave transmits energy, : speed at which the wave transmits energy, measured in m/smeasured in m/s

WavelengthWavelength: Distance between peaks of a wave, : Distance between peaks of a wave, measured in m.measured in m.

Types of WavesTypes of Waves

Transverse waveTransverse wave: Amplitude (disturbance) : Amplitude (disturbance) is perpendicular to direction of propagation is perpendicular to direction of propagation (motion)(motion)

Compression (Longitudinal) WaveCompression (Longitudinal) Wave: : Disturbance is in the direction of Disturbance is in the direction of propagation. propagation.

Adding WavesAdding Waves

SuperpositionSuperposition: When two waves pass : When two waves pass each other they each continue moving each other they each continue moving in the direction they were coming from, in the direction they were coming from, but where they meet their amplitudes but where they meet their amplitudes add up. add up.

Standing WavesStanding Waves

Standing WaveStanding Wave: Wave where there are : Wave where there are points which remain stationary, has a whole points which remain stationary, has a whole or half number of wavelengths over the or half number of wavelengths over the length of the mediumlength of the medium

Node:Node: Location where the wave constantly Location where the wave constantly has 0 amplitudehas 0 amplitude

Anti-nodeAnti-node: Point on a wave where there is : Point on a wave where there is maximum amplitude.maximum amplitude.

MiscellaneousMiscellaneous Wave PulseWave Pulse: Single burst of energy from a source : Single burst of energy from a source

rather than a continuing emission.rather than a continuing emission. ReflectionReflection: When waves reach a barrier they reflect.: When waves reach a barrier they reflect. If the wave hits a fixed barrier it reflects back with If the wave hits a fixed barrier it reflects back with

negative amplitude. If the barrier allows the end of negative amplitude. If the barrier allows the end of the wave to move then the wave is reflected back with the wave to move then the wave is reflected back with a positive amplitude (same side it came in on). If the a positive amplitude (same side it came in on). If the wave changes mediums then part of the wave will wave changes mediums then part of the wave will continue past the intersection and part will be continue past the intersection and part will be reflected back the way it came. The reflected part will reflected back the way it came. The reflected part will be right side up if going into a medium with a lower be right side up if going into a medium with a lower velocity, otherwise it will be inverted.velocity, otherwise it will be inverted.

AssignmentAssignment

Read chapter 14 and summarize each section Read chapter 14 and summarize each section (with a blue or red header) in as short a (with a blue or red header) in as short a statement as possible. After that take your statement as possible. After that take your section summaries and make a one section summaries and make a one paragraph super-summary. This paragraph paragraph super-summary. This paragraph should be as concise as possible.should be as concise as possible.

** This summary is due at the end of class**** This summary is due at the end of class**

HomeworkHomework

Pg 344 Pg 344 (2-4, 6, 11, 12, 25-27, 32-44 even)(2-4, 6, 11, 12, 25-27, 32-44 even)