If you blow air over the top of a fairly large drinking straw you can hear a fundamental frequency due to a standing wave being set up in the straw.
(a) What happens to the fundamental frequency, if while blowing, you cover the bottom of the straw with your fingertip?
(b) What happens to the fundamental frequency, if while blowing, you cut the straw in half with a pair of scissors?
(c) Explain your answers to Parts (a) and (b).