1. The problem statement, all variables and given/known data Sound travels slower in the cold air than warm air. If you place your sound system outside on a cold winter night and listen to your favourite music, will the frequency of the sound change (pitch change)? 2. Relevant equations f x (lambda)= v 3. The attempt at a solution Basically from what I can observe from the formula, either one can be constants, but I don't know which. However when I look at this formula f = v/(lambda), frequency seems to have a constant relationship with velocity. Does that mean that when the speed decreases, the frequency should too?