[填空题]
An organ pipe is 112 cm long. What are ther4 prl1o3,spzbpu0-+z,v0broeg fd* fundamental and first thredn(aggs6r4 tz:a r+ o.e audible overtones if thn4+ org za.s6datg :(re pipe is
(a) closed at one end, $f_{1}$ = Hz $f_{3}$ = Hz $f_{5}$ = Hz $f_{7}$ = Hz
(b) open at both ends?$f_{1}$ = Hz $f_{2}$ = Hz $f_{3}$ = Hz $f_{4}$ = Hz