Effective collision s are those in w hich molecules must:

Effective collisions are those in which molecules must:

Effective collision are those in which molecules must:

Effective collisions are when

Effective colliosions are those in which colloiding molecules must have energy equal or greater than the ............ energy and proper ....

For producing the effective collisions the colliding molecules must have

For producing the effective collisions the colliding molecules must have :