Waves
-Reflection: Waves bounce off a surface that it cannot pass through.
-This does not change speed or frequency, but the wave can be flipped upside down.
-This sends the wave in another direction.
-Refraction: Bending of a wave as it enters a new medium at an angle.
-One side of the wave moves more slowly than the other side.
-medium has changed from air to water.
- The waves get bent.
-Reflection: Waves bounce off a surface that it cannot pass through.
-This does not change speed or frequency, but the wave can be flipped upside down.
-This sends the wave in another direction.
-Refraction: Bending of a wave as it enters a new medium at an angle.
-One side of the wave moves more slowly than the other side.
-medium has changed from air to water.
- The waves get bent.
-Diffraction: Bending of a wave as it moves around an obstacle or passes through a narrow opening.
-It diffracts more if its wavelength is large compared to the size of an opening or obstacle.
-Interference: Occurs when two or more waves overlap an combine together
-Constructive: The waves add together.
-Destructive: The waves subtract from each other as they overlap.
-It diffracts more if its wavelength is large compared to the size of an opening or obstacle.
-Interference: Occurs when two or more waves overlap an combine together
-Constructive: The waves add together.
-Destructive: The waves subtract from each other as they overlap.
-Longitudinal waves: Matter vibrates in the same direction as the wave travels, parallel.
-Also called compressional waves.
-Compression: area where particles on a medium are close together.
-Rarefaction: Area where particles in a medium are spread out.
-Also called compressional waves.
-Compression: area where particles on a medium are close together.
-Rarefaction: Area where particles in a medium are spread out.
-Surface wave: Travels along a surface separating two media, most common are ocean waves.
-Wave speed and Frequency.
-Wave speed and Frequency.
-The Doppler effect: A change in sound frequency caused by motion of the sound source, motion of the listener, or both.
-As a source of sound approaches, an observer hears a higher frequency. When the sound source moves away, the observer hears a lower frequency.
-As a source of sound approaches, an observer hears a higher frequency. When the sound source moves away, the observer hears a lower frequency.
-Sonar: A technique for determining the distance to an object under water.
-Sonar stands for navigation and ranging.
-Sonar stands for navigation and ranging.
Electromagnetic Spectrum
-Electromagnetic Spectrum: The full range of frequencies of electromagnetic radiation.
-This includes radio waves
-Waves used for radio stations and communication.
-Infrared waves: Used to see areas of heat (thermal)
-Visible light: What we can see.
-Ultraviolet Rays: Found in X rays, and other medical and agricultural areas.
-X rays: Used in medicine, industry, transportation, etc... It allows us to look inside of objects. even bodies.
-Gamma Rays: Used to kill cancer cells.
-Electromagnetic Spectrum: The full range of frequencies of electromagnetic radiation.
-This includes radio waves
-Waves used for radio stations and communication.
-Infrared waves: Used to see areas of heat (thermal)
-Visible light: What we can see.
-Ultraviolet Rays: Found in X rays, and other medical and agricultural areas.
-X rays: Used in medicine, industry, transportation, etc... It allows us to look inside of objects. even bodies.
-Gamma Rays: Used to kill cancer cells.
Questions
1. What is Reflection? (see student solutions)
2. Explain the Doppler effect. (see student solutions)
3. What do compression and rarefaction fall under?
4. What does sonar stand for?
1. What is Reflection? (see student solutions)
2. Explain the Doppler effect. (see student solutions)
3. What do compression and rarefaction fall under?
4. What does sonar stand for?
The light bulb application is sonar. Mainly ships and submarines use sonar. Its a neat way to locate things through waves.