|Period||The time it takes for one complete vibration/oscillation/cycle. Units are in seconds. The inverse of frequency|
|Frequency||The number of cycles/vibrations/oscillations per second. Units are the Hertz (Hz) which stands for cycles/sec. The inverse of period.|
|Simple Harmonic Motion|| |
Motion that repeats.
The highest point of a wave.
|Trough||The lowest point of a wave|
|Amplitude||The distance from equilibrium point to the highest or lowest point of a wave. In mechanical waves it is proportional to the energy of the wave.|
|Wavelength||The distance from crest to crest or trough to trough or any point on a wave to the next point where it repeats the motion.|
|Equilibrium point||The resting position of an oscillator where it would eventually come to rest.|
|Wave speed||Dependent on properties of the medium such as density and temperature.|
|Transverse wave|| |
A wave whose medium oscillates at right angles to the direction of the waves' energy.
|Wave||A vibration in space and time.|
|Longitudinal wave||A wave whose medium oscillates parallel to the direction of the waves' energy.|
|Compression||A region of high pressure of the medium in a longitudinal wave.|
|Rarefaction||A region of low pressure of the medium in a longitudinal wave.|
|Electromagnetic waves|| |
Travel at the speed of light. Do not require a medium. The denser the medium, the slower it travels.
|Mechanical waves||Require a medium. The denser the medium the faster they travel.|
The interaction between 2 or more waves.
|Constructive interference||When two waves interact and result in an increased amplitude.|
|Destructive interference||When two waves interact and result in decreased amplitude.|
When a wave bounces of a boundary and travels in a new direction.
|Refraction||The bending of a wave due to a change in the medium's properties.|
|Diffraction||The bending of a wave around an obstacle or through a hole.|
|Absorption||When a wave encounters a boundary and as a result, loses some or all of its energy.|
|Standing wave||A stationary wave pattern formed in a medium when two sets of identical waves pass through the medium in opposite directions.|
|Reverberation||A reflection of a sound wave|
|Doppler effect|| |
change in the apparent frequency of a wave as observer and source move toward or away from each other
|Radio waves||longest wavelength and lowest frequency light wave.|
|medium||The matter that transmits the energy of the wave. Does not travel with the wave's energy.|
|Infrared waves||Sensed as heat.|
|Visible light wave||What humans are able to detect with eyes.|
|Ultraviolet waves||Has enough energy to ionize DNA|
|X-Rays||Are absorbed by bones.|
|Gamma rays||Electromagnetic waves with the shortest wavelengths and highest frequencies. Stars naturally emit these.|
|node||the place in a standing wave where there is no displacement|
|anti-node||the place in a standing wave where there is maximum displacement|
|pitch||corresponds to frequency in sound|
Flickr Creative Commons Images
Some images used in this set are licensed under the Creative Commons through Flickr.com. Click to see the original works with their full license.
- "Simple Harmonic Motion" image
- "Crest" image
- "Transverse wave" image
- "Electromagnetic waves" image
- "Interference" image
- "Reflection" image
- "Doppler effect" image
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