Kaw lub cev yeeb nkab yog ib qho uas tsuas yog ib qho kawg qhib thiab lwm qhov yog kaw thiab suab dhau. Tam sim no, rau lub cev kaw cov yeeb nkab, qhov tseem ceeb zaus tau muab ν=v4L, qhov 'v' yog qhov nrawm ntawm lub suab hauv nruab nrab ntawm lub cev yeeb nkab thiab 'L' yog qhov ntev ntawm cev.
Yuav ua li cas ntawm cov yeeb nkab hauv lub cev yog dab tsi?
Qhov tseem ceeb ntawm cov kav dej qhib lub cev yog 300 Hz. Thawj overtone ntawm cov yeeb nkab muaj qhov zaus tib yam li thawj zaug ntawm cov yeeb nkab kaw.
Qhov tseem ceeb ntawm cov kav dej qhib yog dab tsi?
Qhov tseem ceeb ntawm cov kav dej qhib yog 30 Hz.
Dab tsi yog qhov sib piv ntawm cov yeeb nkab qhib lub cev?
(b) Qhib lub cev yeeb nkab
Qhov no yog thawj lub suab lossis qhov thib ob sib haum xeeb. Yog li qhov zaus ntawm Pth overtone yog (P + 1) n1 qhov twg n1 yog yooj yim zaus. Lub frequencies ntawm harmonics yog nyob rau hauv qhov ratio ntawm 1: 2: 3.
Yuav ua li cas kaw lub cev?
Lub cev cov yeeb nkab uas ib kawg qhib thiab lwm qhov kawg kaw yog hu ua cov yeeb nkab. Lub raj mis, xuav, thiab lwm yam yog cov piv txwv ntawm cov yeeb nkab kaw.