1- Waves do not carry matter.

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Presentation transcript:

1- Waves do not carry matter. Chapter 17 WAVES I- Properties of Waves. A- Waves Carry Energy 1- Waves do not carry matter.

All Waves can be described by the same set of properties. B- Describing Waves All Waves can be described by the same set of properties. 4-Wavelength 3- Amplitude 1- Crest 3- Amplitude 2- Trough 4-Wavelength

Properties of Waves. 1- Crest = Highest point of Wave 2- Trough = Lowest point of wave 3- Amplitude = Distance from dash line to crest or trough, it tells how much energy a wave has. More height more energy. 4- Wavelength = distance from crest to crest or trough to trough.

Wavelength Crest Amplitude Trough

A B C

5- Frequency: The number of waves that pass a point in a certain amount of time. The unit is Hertz (Hz) One wave per second

II- Wave Motion: A- Transverse Waves: Cause matter to move perpendicularly to the waves direction (Up & Down)

B- Compressional Waves: Causes. matter to move parallel to the waves B- Compressional Waves: Causes matter to move parallel to the waves direction (Back & Forth) Sound waves. 1-Rarefaction: when a compressional wave spread apart = Trough 2- Compression = Crest

III- Behavior of Waves: A- Wave refraction is the bending of a wave as it enters a new material, the waves speed changes.

B- Wave reflection: The wave bounces B- Wave reflection: The wave bounces off the surface at the same angle but opposite direction.

C- Polarized waves: the waves crest and troughs move in one perpendicular direction.

D- Interference: Is the result of different waves moving through one another.

IV- Electromagnetic Spectrum: Tells the different frequency of the waves.

A- How the High –Energy Waves Affect Us. 1- Gamma rays- used to kill cancer cells. 2- X-rays - used to see bones. 3- Ultraviolet - used to sterilize objects also gives you a tan.

B- Using Low-Energy Waves: Light waves are waves that people can see 1- Light Waves = to see 2-Infrared Waves = Heat 3- Microwaves = Cooking

4- Radio waves = LONGEST WAVES