[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

physics/photoelectric_effect.py

@@ -59,6 +59,8 @@ def maximum_kinetic_energy(
     if in_ev:
         return max(PLANCK_CONSTANT_EVS * frequency - work_function, 0)
     return max(PLANCK_CONSTANT_JS * frequency - work_function, 0)
+
+
 def work_function(
     frequency: float, kinetic_energy: float, in_ev: bool = False
 ) -> float:
@@ -98,6 +100,7 @@ def work_function(
         return PLANCK_CONSTANT_EVS * frequency - kinetic_energy
     return PLANCK_CONSTANT_JS * frequency - kinetic_energy
 
+
 if __name__ == "__main__":
     import doctest