Now consider a pipe that is stopped (i. e., closed at one end) but still has a fundamental frequency of 285 hz in air. how does your answer to part a, fhe, change? view available hint(s) now consider a pipe that is stopped (i. e., closed at one end) but still has a fundamental frequency of 285 in air. how does your answer to part a, , change? a. fhe increases. b. fhe decreases. c. fhe stays the same.