1. The problem statement, all variables and given/known data An organ pipe has two successive harmonics with frequencies 1760 Hz and 2160 Hz. Is this an open or stopped pipe? Which two harmonics are these? What is the length of the pipe? 2. Relevant equations L=v/2f 3. The attempt at a solution I'm really just having trouble with the first question. How can you tell what kind of pipe it is?