[填空题]
A science museum has a displ0 (4e qel)uxsoatqu7:9tmhrj5 z9p7jay called a se5x:z 8h:vmsv0x ftlbn k3pq 6(wer pipe symphony. It consists of many plastic pipes of various lengths, which are open on xtlqvz5(0n3b8 m 6 xvsfhk: p:both ends.
(a) If the pipes have lengths of 3.0 m, 2.5 m, 2.0 m, 1.5 m and 1.0 m, what frequencies will be heard by a visitor’s ear placed near the ends of the pipes?
$f_{3.0}$ = Hz
$f_{2.5}$ = Hz
$f_{2.0}$ = Hz
$f_{1.5}$ $\approx$ Hz (Round to the nearest integer)
$f_{1.0}$ $\approx$ Hz (Round to the nearest integer)
(b) Why does this display work better on a noisy day than on a quiet day?
