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13 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Amplitude
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the maximum displacement measured from minimum. measured in metres
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Highest value on wave
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Wavelength
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Transverse - distance between two troughs
Longtitudinal - distance between two compressions Measured in metres |
Distance
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Wave Speed
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speed of a wave profile
Measured in metres per second (ms-1) wave speed = frequency x wavelength |
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Period
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the time for one complete cycle
measured in seconds T = 1/f |
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Frequency
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the number of waves made every second
Measured in hertz (hz) f = 1/t |
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Resolution
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the smallest size that can be distingushed
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Think TV
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Bytes
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8 bits = 1 byte
256 possibilities number of alternatives N = 2^i log2(number of alternatives) = number of bits / i |
computing
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logarithmic scales
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distances of orders of magnitudes can be shown
equal distances = equal multiples ie a step upwards x 1000 |
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Image processing
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images stored as numbers can be manipulated
Smoothen edges - replace each pixel by mean of its and neighbours values Removing noise - replace each pixel by median of its and neighbours values Finding edges - laplace rule . subtract NSEW values from 4x value of each pixel |
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Lenses and refractive index
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Changes the curvature of a wavefront. Bending the rays
refractive index = speed of light in vacuum / speed of light in material light travels slower in glass than air/vacuum |
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lenses and curvature
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curvature of waves going out = curvature in + curvature added
1/v = 1/u + 1/f u = distance of source to lens v = distance of image from lens f = focal length |
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lens power
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power = 1/f
measured in D - Dioptres same as curvature added by lens |
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Magnification
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m = v/u
v = image height/distance u = object height/distance |
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