Amplitude - Height measured from the middle to a crest (m), Wavelength - Distance from crest to crest (m), Frequency - Number of waves produced per second (Hz), Velocity - Speed of the travelling wave (m/s), Period - Time for one wave to pass a point (s), Energy - What waves carry, Decibels - Unit that sound level is measured in, Ultrasound - The name given to sounds above 20 000Hz, Diffraction - The bending of waves round an obstacle, Reflection - When waves bounce off an object,

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