Amplitude - The maximum Displacement of a wave from it's equilibrium position, Concave Lens - A lens that is thicker at the edges than the centre. Parallel rays diverge., Convex Lens - A lens that is thicker in the centre than at the edges. Parallel rays converge., Diffusion Reflection - The reflection of a wave from a rough surface that results in the wave being scattered., Electromagnetic Spectrum - A group of transverse waves that cover a large range of frequencies and wavelengths. frequencies and wavelengths., Electromagnetic Waves - Transverse waves that transfer energy from the source of the waves, to an absorber., Focal Length - The distance between the centre of a lens and its principal focus., Frequency  - The number of waves passing a given point in a second., Gamma Rays - High energy radiation rays used for detecting and treating cancers, and sterilising food and medical implements. They can cause cell damage and mutations., Hertz (Hz) - The unit of frequency., Infrared Radiation - A type of radiation that all objects emit and absorb. The hotter the object is the more radiation it emits., Law of Reflection - The angle of incidence must always equal the angle of reflection when a wave reflects., Longitudinal Waves - Waves with oscillations that are parallel to the direction of travel/energy transfer., Microwaves - Used for satellite communications and for cooking food., Power of a Lens - Equal to the reciprocal of the focal length of a lens., Principle Focus - The point before or after a lens where light rays appear to meet., Radio Waves - Used for television and radio signals., Ray Diagram - A visual representation of the path of a wave., Reflection - The bouncing back of a wave at a boundary., Refraction - The changing speed of a wave which leads to a change in direction., Seismic Waves - Waves that are produced by earthquakes., Speed of EM Waves - 3x10^8m/s, Transverse Waves - Waves with oscillations that are perpendicular to the direction of travel/energy transfer., Ultrasound Waves - Waves over 20 kHz, Wavefront - An imaginary surface representing points of a wave that are at the same point in their cycle., Virtual Image - An image produced by the apparent, but not actual., Real Image - An image produced by light-rays physically converging., X-Rays - Used for medical imaging and security scanners. They can cause cell damage and mutations, Ultraviolet  - Used in energy efficient lamps, disinfecting water, and for sun tanning.,

Waves-Charles GCSE, Physics, JMc, OCR, Gateway, KS4

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