http://image77.webshots.com/77/3/45/53/2222345530105857182ZSQvzS_fs.jpg
the freq. of the sound produced by a musical instrument is slightlt higher than 3000Hz. a tunnung fork(freq:3000Hz) is placed beside the musical instrument to measure the exact value of its freq.
(a) what is the beat freq. produced?
(b) what is the freq. of the musical instrument ?
(c) sketch the displacement/t graph of air molecule at A
AL phy (urhent!!)
2010-02-16 3:35 am
回答 (1)
2010-02-18 1:50 am
✔ 最佳答案
a. As the loudness of the wave has a period of 2 s, it corresponds to 1 period of the beat.So, the beat frequency = 1/2 = 0.5 Hz
b. The frequency of the musical instrument = 3000 + 0.5 = 3000.5 Hz
參考: Physics king
收錄日期: 2021-04-19 21:22:05
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20100215000051KK00938