I'm studying sound waves with Halliday's book, and after reading the whole chapter, one of the questions suggested was:
What is the experimental evidence that allows the assumption that the sound wave velocity in air is the same for all wavelengths?
I was surprised that such an apparently simple question really caught me. I can't seem to think of a better answer than
"The fact that we make experiments and see that the velocity is the same for all wavelengths".
But of course there must be a better answer, this one is just Why?? Because yes.
What would be a better answer to that question?