# Chapter 16: Photoconductivity¶

## Example 16.1, page no-416¶

In [1]:
#Pairs generated per second

import math
#Variable Declaration
lam=0.4*10**-6                    # wavelength of light
A=4*10**-6                        # area of the crystal
in1=200.0                         # intensity of light in W/m^2
h=6.626*10**-34                   # Planck's constant
c=3*10**8                         # speed of light

#Calculation
N=in1*A*lam/(h*c)

#Result
print('The number of pairs generated per second is %.3f * 10^14'%(N*10**-14))

The number of pairs generated per second is 16.098 * 10^14


## Example 16.2, page no-417¶

In [2]:
# Wavelength of emitted radiation

import math
#Variable Declaration
e=1.6*10**-19                 # Charge of electron
eg=1.43                       # band gap energy in eV
h=6.626*10**-34               # Planck's constant
c=3*10**8                     # speed of light in m/s

#Calculation
E=e*eg
lam=h*c/E

#Result
print('The wavelength of emitted radiation is %.2f µm'%(lam*10**6))

The wavelength of emitted radiation is 0.87 µm