#initialisation of variable
from math import *
M=.1;#mobility
t=300;#kelvin
n=.26;
q=1.6*10**-19;#C
m=9.1*10**-31;#kg
v=100000;#m/s
#calculation
T=(n*m*M)/q;#mean free time
P=v*T;#mean free path
#result
print"mean free time is",round(T*10**12,3),"ps"
print"mean free path is",round(P*10**9,1),"nm"
#initialisation of variable
from math import *
D=10**16;#doping
n=1300;
q=1.6*10**-19;#Charge
#calculation
R=1/(D*n*q);#resistivity
#result
print"resistivity is",round(R,2),"ohm-cm"
#initialisation of variable
from math import *
D=10**16;#doping
W=500;#width
A=2.5/1000;#area
I=1;#mA
B=10**-4;#Wb/cm^2
q=1.6*10**-19;#charge
#calculation
R=-1/(q*D);#hall coefficient
Vh=(R*I*B*W)/A;#hall voltage
#result
print"Hall voltage is",round(Vh/10000,2),"mV"
#initialisation of variable
from math import *
T=300;#K
n1=10**18;#concentration
n2=7*10**17;#concentration
x=.1;#distance
D=22.5;#diffusion coefficient
q=1.6*10**-19;#charge
#calculation
Id=q*D*(n1-n2)/x;#diffusion current
#result
print"diffusion current density is",round(Id,2),"A/cm^2"
#initialisation of variable
from math import *
E=50;#V/cm
x=1;#cm
t=.1#ms
#calculation
Vd=x/t;#drift velocity
u=Vd/E;
D=.0259*u;#diffusivity
#result
print"drift velocity is",round(Vd*1000,2),"cm/s"
print"diffusivity is",round(D*1000,2),"cm^2/s"
#initialisation of variable
from math import *
n1=10**14;#concentration
n2=9.65*10**9;
n3=10**13;#hole-pair concentration
t=2;#time
#calculation
p=((n2)**2)/n1;
C=p+t*n3;#concentration
#result
print"change in minority carrier concentration is",round(C/10**13)*10**13,"cm^-3"
#initialisation of variable
from math import *
t1=100;#time
t2=200;#time
f=5;#factor
#calculation
L=(t2-t1)/log(f/2**.5);#lifetime
#result
print"minority carrier lifetime is",round(L,0),"micro sec"
#initialisation of variable
from math import *
E1=4.05;#eV
E2=.2;#eV
n=2.86*10**19;#concentration
E3=.6;#eV
#calculation
N1=n*exp(-(E1+E2)/.0259);#electron density
N3=n*exp(-(E2+E3)/.0259);#electron density
#result
print"emitted electron density 1 is",round(N1/2,52),"is almost equals 0"
print"emitted electron density 2 is",round(round(N3/1000000)*10**6,2),"cm^-3"