Waves definitions 0.0 / 5 ? PhysicsWavesASOCR Created by: HannahDeanCreated on: 14-04-16 21:02 Displacement hown far a point on the wave has moved from its undisturbed position 1 of 20 Amplitude The maximum magnitude of the displacement 2 of 20 Wavelength the length of one whole wave ccle (crest to crest) 3 of 20 Period time taken for a whole cycle to complete 4 of 20 Frequency number of cycles per second passing a given point (1/period) 1Hz = 1s^-1 5 of 20 Phase a measurement of the position of a certain point along the wave cycle 6 of 20 Phase difference the amount one wave lags behind another 7 of 20 Intensity the rate of flow of energy per unit area at right angles to the direction of travel of the wave (Wm^-2) Power/Area 8 of 20 Electromagnetic spectrum (p77) Radiowaves, microwaves, Infra-red, visible light, ultraviolet, x-rays, gamma rays 9 of 20 A polarising filter only transmits vibrations in one direction. E.g. 3D films and polarised sunglasses 10 of 20 Ripple tank and oscillating paddle Apparatus used to investigate diffusion 11 of 20 Reflection (waves) The wave is bounced back whenit hits a boundary. i = r. (ripple tank) 12 of 20 Refraction The way a wave changes direction as it enters a different medium. Towards the normal - more dense - slows down. 13 of 20 refractive index The ratio between the speed of light in a vacuum and the speed of light in that material - n = c/v 14 of 20 n1 x sin*angle*1 = (constant) and n2 x sin*angle*2 15 of 20 interference When two or more waves superpose with each other.consstructive = crest+crest or trough+trough. Destructive = equal crest and trough 16 of 20 In phase points with a phase difference of 0 or a multiple of 360 17 of 20 coherence Same wavelength and frequency and a fixed phase difference between them 18 of 20 path difference the amount by which the path travelled by one wave is longer than the path travelled by the other wave 19 of 20 Stationary waves The superstition of two progressive waves with the same wavelength, moving in opposite directions 20 of 20
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