Waves definitions

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Displacement
hown far a point on the wave has moved from its undisturbed position
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Amplitude
The maximum magnitude of the displacement
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Wavelength
the length of one whole wave ccle (crest to crest)
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Period
time taken for a whole cycle to complete
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Frequency
number of cycles per second passing a given point (1/period) 1Hz = 1s^-1
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Phase
a measurement of the position of a certain point along the wave cycle
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Phase difference
the amount one wave lags behind another
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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
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Electromagnetic spectrum (p77)
Radiowaves, microwaves, Infra-red, visible light, ultraviolet, x-rays, gamma rays
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A polarising filter
only transmits vibrations in one direction. E.g. 3D films and polarised sunglasses
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Apparatus used to investigate diffusion
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Reflection (waves)
The wave is bounced back whenit hits a boundary. i = r. (ripple tank)
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Refraction
The way a wave changes direction as it enters a different medium. Towards the normal - more dense - slows down.
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refractive index
The ratio between the speed of light in a vacuum and the speed of light in that material - n = c/v
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n1 x sin*angle*1 =
(constant) and n2 x sin*angle*2
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interference
When two or more waves superpose with each other.consstructive = crest+crest or trough+trough. Destructive = equal crest and trough
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In phase
points with a phase difference of 0 or a multiple of 360
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coherence
Same wavelength and frequency and a fixed phase difference between them
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path difference
the amount by which the path travelled by one wave is longer than the path travelled by the other wave
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Stationary waves
The superstition of two progressive waves with the same wavelength, moving in opposite directions
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Other cards in this set

Card 2

Front

The maximum magnitude of the displacement

Amplitude

Card 3

Front

the length of one whole wave ccle (crest to crest)

Card 4

Front

time taken for a whole cycle to complete

Card 5

Front

number of cycles per second passing a given point (1/period) 1Hz = 1s^-1