[填空题]
An organ pipe is 112 cm long. What are th-a0 9tqkurm,my:ogj9 e fundamental and first three audi gjg va1*)2lpfble overtones if t*avl f1g)jg 2phe 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
