Physics D 0.0 / 5 ? PhysicsKeywordsGCSEAQA Created by: Atlanta and JacobCreated on: 19-11-16 09:08 Deceleration Change of velocity per second when an object slows down. 1 of 9 Diffraction The spreading of waves when they pass through a gap or around the edges of an obstacle that has a similar size as the wavelength of the waves. 2 of 9 Diode Electrical device that allows current to flow in one direction only. 3 of 9 Dioptre The unit of lens power, D. 4 of 9 Direct current Electric current in a circuit that is in one direction only. 5 of 9 Directly proportional A graph will show this if the line of best fit is a straight line through the origin. 6 of 9 Diverging lens A lens that makes light rays parallel to the axis diverge (i.e. spread out)as if from a single point; also referred to as a concave lens. 7 of 9 Doppler effect The change of wavelength (and frequency) of the waves from a moving source due to the motion of the source towards or away from the observer. 8 of 9 Drag force A force opposing the motion of an object due to fluid (e.g. air) flowing past the object as it moves. 9 of 9
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