wave.
2007-04-10 12:43 am
回答 (1)
2007-04-10 2:57 am
✔ 最佳答案
f = 1/Tf = 1/4
f = 0.25Hz
or
velocity of the puse = (40/100 ) / 4 = 0.1ms-1
v = f 入
0.1 = f (0.4)
f=0.25Hz
收錄日期: 2021-04-12 21:53:33
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070409000051KK03308