1. The problem statement, all variables and given/known data Translated from swedish so i hope i get it right... Observe vibrations along the axis of the bond in a hydrogen molecule (H2). For low temperatueres, by which factor does the rms value ("root-mean-square deviation") of these vibrations amplitude change if one of the hydrogen atoms is changed for a deuterium atom? My problem is that i dont really know where to begin. So im not asking for a solution (becasue i know you wont give me one) but a push in the right direction.