Unit 1 Physics: Waves in Communication 5.0 / 5 based on 2 ratings ? Applied ScienceWaves in CommunicationBTEC NationalEdexcel Created by: charlottehorneCreated on: 27-06-21 11:45 Frequency The number of oscillations (vibrations) per second. 1 of 32 Periodic time The time taken to complete one oscillation. periodic time= 1/ frequency 2 of 32 Amplitude The largest distance between the point that the wave moves from its rest position. 3 of 32 Wavelength The distance between two adjacent wavefront peaks. 4 of 32 Wave speed The speed that it takes the wave to travel to a given point in a period of time. 5 of 32 Phase Describes how far through a cycle a wave is. 6 of 32 Phase difference A measure of the difference in where two waves are in their cycle. 7 of 32 Transverse waves When particles in the medium vibrate at right angles to the direction of the wave's motion. 8 of 32 Longitudinal waves When the medium's particles vibrate in the same direction as the wave's motion. 9 of 32 Stationary wave When two progressive waves (same wavelength/ frequency) move in opposite directions, interfering with eachother. 10 of 32 Node A point on a stationary wave that have zero amplitude. 11 of 32 Anti-node A point which oscillate from the furthest point upwards to the furthest point downwards. 12 of 32 Electromagnetic waves Vibrating electrical/ mechanical fields that travel through space with no medium. 13 of 32 Displacement The distance at any given moment from the central/ equilibrium position. 14 of 32 Path difference The number of cycle's difference there's between two waves from the same source. 15 of 32 Refraction When light enters a more dense medium and bends towards the normal. 16 of 32 Diffraction The spreading of waves when they pass through a gap or move past an obstacle. 17 of 32 Reflection The change in the direction of a wave that can either be light or sound, away from the wave boundary. 18 of 32 Specular reflection Defined as light reflected from a smooth surface at a definite angle. 19 of 32 Diffuse reflection Waves that are produced by rough surfaces that tend to reflect light in all directions. 20 of 32 Superposition The net displacement of the medium at any point in space or time, is simply the sum of the individual wave displacements. 21 of 32 Constructive interference When both waves have the same sign displacement. 22 of 32 Destructive interference At the point of overlap, if the waves have opposite displacements, they will cancel eachother out. 23 of 32 Coherent The superposition of the waves gives a visible interference pattern. 24 of 32 Single slit diffraction When light passes through a narrow slit, a pattern of alternate bright and dark fringes are produced. 25 of 32 Resonance When an object is made to oscillate at its natural frequency, it creates large amplitude oscillations. 26 of 32 Optical density The degree at which the light refracts through a medium. 27 of 32 Refractive index A number that denotes how light passes through a medium/ how much light is refracted. 28 of 32 Total internal reflection Complete reflection of a light ray reaching a boundary greater than the critical angle. 29 of 32 Optical fibres Used to transmit light, communication and medicinal applications; cylindrical core of glass encased in glass cladding. 30 of 32 Analogue signals Signals that continuously vary in frequency and amplitude. 31 of 32 Digital signals Signal of a sequence of discrete values (either 0 or 1). 32 of 32

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