#importing modules
import math
from __future__ import division
#Variable declaration
e=1.6*10**-19; #charge(coulomb)
n=10; #number of particles
E=4*10**6; #energy of alpha particle(eV)
E1=35; #energy of 1 ion pair(eV)
#Calculation
N=E*n/E1; #number of ion pairs
q=N*e; #current produced(amp)
#Result
print "current produced is",round(q*10**13,3),"*10**-13 amp"
#importing modules
import math
from __future__ import division
#Variable declaration
v=4; #voltage sensitivity(div/volt)
d=0.8; #number of divisions
C=0.5*10**-12; #capacitance(F)
e=1.6*10**-19; #charge(coulomb)
E1=35; #energy of 1 ion pair(eV)
#Calculation
V=d/v; #voltage(V)
q=C*V; #current(C)
n=q/e; #number of ion pairs required
E=n*E1/10**6; #energy of alpha-particles(MeV)
#Result
print "number of ion pairs required is",n/10**5,"*10**5"
print "energy of alpha-particles is",E,"MeV"
#importing modules
import math
from __future__ import division
#Variable declaration
V=1000; #voltage(V)
r=0.0001; #radius(m)
b=2*10**-2; #diameter(m)
a=10**-4;
n=10**9; #number of counts
#Calculation
Emax=V/(r*math.log(b/a)); #maximum radial field(volts/meter)
N=n/(50*30*60*3000); #counter will last for(years)
#Result
print "maximum radial field is",round(Emax/10**6,2),"*10**6 volts/meter"
print "counter will last for",round(N,1),"years"
#importing modules
import math
from __future__ import division
#Variable declaration
r=2; #radius(m)
B=2.5; #flux density(Wb/m**2)
q=1.6*10**-19; #charge(coulomb)
c=3*10**8; #velocity of light(m/sec)
#Calculation
E=B*q*r*c*10**-6/q; #energy of the particle(MeV)
#Result
print "energy of the particle is",int(E),"MeV"
#importing modules
import math
from __future__ import division
#Variable declaration
cr=600; #counting rate(counts/minute)
e=10**7; #number of electrons per discharge
q=1.6*10**-19; #charge(coulomb)
t=60; #number of seconds
#Calculation
n=cr*e; #number of electrons in 1 minute
q=n*q/t; #average current in the circuit(A)
#Result
print "average current in the circuit is",q,"A"