The thinnest blood vessels in your body are .
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Ответ:
Ответ:
the depth below the silicon surface at which the aluminum concentration would be atoms/ is
Explanation:
The concentrations of a diffusing element in a silicon wafer at any particular position below the surface and the time it takes to reach that concentration has a relationship given by Fick's second law
Where
The concentration of the carbon on the gear surface is
The initial uniform (normal) concentration of carbon in the gear is
The concentration of carbon at a distance x below the gear surface after time t is
Distance below the gear surface is x
Diffusivity of carbon at a given temperature is D
Time is t
erf is a mathematical function called error function
The impurity diffusion is a method in which an impurity is diffused into a silicon wafer at a very high temperature.The given values are
= atoms/
= 0 atoms/
= atoms/
t = 206 minutes = 12360 s [1 minutes= 60 seconds ]
For an aluminum diffusing in silicon at 11100°C Diffusivity is
Substituting these values we have
Let assume
Hence
To determine for what number the error function is 0.99
The table on the first uploaded image is a table that error function for some number
Where z is the same thing as R
calculating the R (i.e z) value whose error function is 0.99 , using the interpolation method we have
Substituting the value of R in the equation 2 we have
So therefore the value of x is
Hence the depth below the silicon surface at which the aluminum concentration would be atoms/ is