1. Waves Introduction Chapter 10 Section 1 and 2 Physics Standard 4

2. Physics Science that deals with matter, energy and their interactions

3. Definition Wave: disturbance that carries energy through matter or space. Matter through which a wave travels is called its medium. Waves transfer energy and energy spreads out at it travels.

4. Medium Examples What is the Medium? Water Air

5. Mechanical vs. Electromagnetic Mechanical waves: require a medium to travel through. Ex: Sound Electromagnetic waves: do not require a medium. Ex. light

6. Mechanical Types 1) Transverse: causes particles of medium to vibrate perpendicularly to direction wave travels. Ex: water http://www.acoustics.salfor d.ac.uk/feschools/waves/fla sh/transverse.swf Transverse Wave

7. Crest: highest pt Trough: lowest pt Amplitude: greatest distance that particles in medium move when a wave passes. Wavelength: dist. from 1 crest of wave to next crest. Frequency: # of full wavelengths that pass a point in a given time.

8. Characteristics of a Transverse Wave

9. Rules Higher amplitude + Short wavelength  wave carries much energy. Low amplitude + long wavelength  wave carries little energy. Which One Carries More Energy?

10. Mechanical Types 2) Longitudinal: causes particles of medium to vibrate parallel to direction the wave travels. Ex: sound

11. Longitudinal Wave Characteristics Compression: area where particles are close together. Rarefaction: area where particles are spread out.

12. Sound: Longitudinal Wave Sound wave speed depends on medium it is in. Sound in air: 340 m/s Sound in water: 3 x’s faster than in air. Sound in solid: 15-20 x’s faster than in air.