Amplitude (A) - the distance from the middle of the wave to the top (or the bottom) measured in metres. Maximum displacement from the mean position!, Diffraction - occurs when wave meet a barrier, the waves bend around an obstacle. Long waves diffract more thank short waves., Energy and waves - Waves transmit energy. The greater the amplitude the more energy is transferred., Frequency, (f) - number of waves produced or passing a point per second. (Hertz or Hz), Longitudinal wave - In a longitudinal wave the particles move along the line of the direction of travel of energy., Period. (T) - Time for one wave to pass a point or time for one wave to be produced. (s), Principle of reversibility of light - The principle of reversibility of light states that a ray of light which travels along any particular path from some point A to another point B travels by the same path when going from B to A., Sonar - Sound navigation and ranging – a technique used to see and find the distance to objects under water, Speed, (v) - rate of covering a distance. Number of metres travelled per second. (ms-1) The speed of the waves is represented by the formula, Speed of light - 3.0 x 108 m s-1 in a vacuum and in air. The fastest speed in the universe, Speed of sound - 340 m s-1 in air, sound travels more quickly in solids and liquids e.g. 1500 m s-1 in water, Transverse wave - In a transverse wave the particles move at 90 degrees to the direction of the flow of energy., Ultrasound - Frequencies of sound above human hearing at frequencies greater than 20 000 Hz, Wave - a way of transferring energy., Wave speed - the speed at which the wave travels, Wavelength, (λ) - The wavelength of a wave is the horizontal distance between two adjacent troughs or crests or any two corresponding points on the wave,

Waves Glossary Pt1 N5

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