





'''simple docstring'''






from math import log

from scipy.constants import Boltzmann, physical_constants

A__    :       List[str]              =3_00  # TEMPERATURE (unit = K)
def        UpperCamelCase__				(		lowerCAmelCase							,     lowerCAmelCase							,     lowerCAmelCase							,     ):





      """simple docstring"""


      if donor_conc <= 0:
            raise ValueError("""Donor concentration should be positive"""  )
      elif acceptor_conc <= 0:
            raise ValueError("""Acceptor concentration should be positive"""  )
      elif intrinsic_conc <= 0:
            raise ValueError("""Intrinsic concentration should be positive"""  )
      elif donor_conc <= intrinsic_conc:
            raise ValueError(
                """Donor concentration should be greater than intrinsic concentration"""  )
      elif acceptor_conc <= intrinsic_conc:
            raise ValueError(
                """Acceptor concentration should be greater than intrinsic concentration"""  )
      else:
            return (
                Boltzmann
                * T
                * log((donor_conc * acceptor_conc) / intrinsic_conc**2  )
                / physical_constants["electron volt"][0]
            )


if __name__ == "__main__":
      import doctest

      doctest.testmod()













'''simple docstring'''






def        UpperCamelCase__				(		lowerCAmelCase							,     lowerCAmelCase  ):





      """simple docstring"""


      if len(lowerCAmelCase  ) != len(lowerCAmelCase  ):
            raise ValueError("""String lengths must match!"""  )

      _lowerCAmelCase												=							0

      for chara, chara in zip(lowerCAmelCase							,     lowerCAmelCase  ):
            if chara != chara:
                  count += 1

      return count


if __name__ == "__main__":
      import doctest

      doctest.testmod()






