I'm confused by the following excercise:
A violin string is put next to a speaker. The speaker goes through all the frequencies between 50Hz and 1500Hz. It is observed that the string only resonates at 880Hz and 1320Hz. [...]
These are the 2nd and 3rd harmonics respectively. However I would expect the first harmonic (the fundamental), which is also present in the [50, 1500]Hz interval to resonate. Why is this not the case?
This question is not about how to solve it. In fact, I have not even given a the task, because it is irrelevant to my question.