問題詳情
16. Bats can detect small objects such as insects that are of a size on the order of a waveleng
a chirp at a frequency of 60 kHz and the speed of soundwaves in air is 330 m/s
smallest size insect they can detect?
(A) 1.5 mm
(B) 3.5 mm
(C) 5.5 mm
(D) 7.5 mm
(E) 9.8 mm
參考答案
答案：C
統計：A:0,B:0,C:1,D:0,E:0
難度：計算中