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# Sound/waves

Vibration A repeating back and forth motion
Crest The highest point of a wave
Trough The lowest point of a wave
Doppler The effect that describes the apparent change in frequency of a moving source
compressional When energy moves by compressing the energy in the same direction as the wave travels
Period The time it takes for one wave to pass by a fixed point
Frequency The amount of waves that travel by a fixed point in a certain period of time
Hertz 1 wave per second
Transverse Type of wave where the energy travels perpendicular to direction of motion.
Wavelength Distance from one point on a wave to the next identical point
Medium substance that the wave travels through
Amplitude The amount of energy a wave has
Decreases As wavelength increases frequency generally __________
Red As galaxies move away they create a ______ shift in the electromagnetic spectrum
Blue as galaxies move towards us they create a _____ shift in the electromagnetic spectrum
Created by: spillsbury

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