Cov Qauv Ntxaib Transverse Wave Longitudinal Wave Stationary Wave

Piv txwv ntawm cov lus nug thiab cov qauv rau cov nthwv dej transverse, nthwv dej longitudinal, nthwv dej stationary

Cov nthwv dej hla

1. Qhov nrug ntawm ob lub qhov dej uas sib ze ntawm nthwv dej yog 20 m. Ib yam khoom ntab saum dej thiab muaj kev co. Yog tias lub sijhawm rau ib qho kev co yog 4 vib nas this, ces qhov ceev ntawm nthwv dej yog .... m/s

1. 20
2. 15
3. 10
4. 5

Kev Sib Tham
Nws paub tias:
Qhov ntev ntawm nthwv dej (λ) = 20 meters
Lub Sijhawm (T) = 4 vib nas this
Nug: Qhov ceev ntawm nthwv dej (v)
Lus teb:
Cov qauv ceev ntawm nthwv dej:
v = λ / T = 20 meters / 4 vib nas this = 5 meters / vib nas this
Cov lus teb yog D.

2. Ob lub ntsiab lus A thiab B nyob rau ntawm ib txoj hlua thiab sib nrug 90 cm. Ib nthwv dej hla mus rau ntawm txoj hlua , yog li ntawd lub ntsiab lus A nyob ntawm qhov siab tshaj plaws ntawm nthwv dej, lub ntsiab lus B nyob hauv qab ntawm nthwv dej, thiab ntawm lawv muaj ob lub ntsiab lus thiab ob lub hauv qab ntawm nthwv dej. Yog tias lub sijhawm nthwv dej yog 0,3 vib nas this, ces qhov ceev ntawm nthwv dej kis yog….

1. 10,8 cm / s
2. 18,0 cm / s
3. 120,0 cm / s
4. 200,0 cm / s

Kev Sib Tham
Nws paub tias:
Qhov Nrug Deb AB (l) = 90 cm
Lub sijhawm nthwv dej (T) = 0,3 vib nas this
Zaus ntawm nthwv dej (f) = 1/0,3 vib nas this
Point A yog nyob rau ntawm lub ncov ntawm nthwv dej, point B yog nyob rau hauv qab ntawm nthwv dej
Nruab nrab ntawm cov ntsiab lus A thiab B muaj ob lub ncov thiab ob lub hauv qab ntawm nthwv dej
Nug: Qhov ceev ntawm nthwv dej (v = f λ)
Lus teb:
Raws li daim duab, nws xaus lus tias muaj 2,5 wavelengths. Qhov deb ntawm ib wavelength (λ) = 90 cm / 2,5 = 36 cm

Kev ceev ntawm nthwv dej:
v = f λ = (1/0,3)(36) = 36/0,3 = 120 cm/s.
Cov lus teb yog C.

3. Daim duab hauv qab no qhia txog kev hloov chaw ntawm ib qho chaw hauv ib qho nruab nrab ua ib qho haujlwm ntawm lub sijhawm thaum nthwv dej hla dhau qhov nruab nrab.
Yog tias qhov wavelength yog 6 meters, ces qhov ceev ntawm nthwv dej yog ...

1. 3 m / s
2. 6 m / s
3. 8 m / s
4. 12 m / s

Kev Sib Tham
Nws paub tias:
Muaj 2 lub wavelengths raws li daim duab saum toj no.
Qhov nrug ntawm 1 wavelength (λ) = 6 meters / 2 = 3 meters.
Lub Sijhawm (T) = 0,5 vib nas this
Nug: Qhov ceev ntawm nthwv dej (v)
Lus teb:
v = f λ = λ / T = 3 meters / 0,5 vib nas this = 6 meters / vib nas this
Cov lus teb yog B.

Cov nthwv dej ntev

4. Ob lub suab tau raug suab tib lub sijhawm hauv tib lub nruab nrab thiab qhov kub. Lub suab thawj zaug muaj zaus ntawm 640 Hz thiab lub suab thib ob yog 1280 Hz. Cov lus tseeb yog….

1. Qhov ceev ntawm lub suab thawj zaug loj dua qhov ceev ntawm lub suab thib ob
2. Qhov ceev ntawm lub suab thawj zaug me dua li qhov ceev ntawm lub suab thib ob
3. Qhov ceev thawj zaug thiab thib ob ntawm lub suab yog tib yam
4. Ntev suab nthwv dej ob qho tib si loj sib npaug

Kev Sib Tham
Qhov ceev ntawm lub suab nyob ntawm qhov nruab nrab, yog li ntawd yog tias qhov nruab nrab zoo ib yam, qhov ceev ntawm ob lub suab yuav zoo ib yam. Ntawm qhov tod tes, yog tias qhov zaus siab, qhov wavelength yuav me me, thiab ib yam li ntawd, yog tias qhov zaus qis, qhov wavelength yuav loj. Qhov zaus ntawm ob lub suab sib txawv, yog li qhov wavelength ntawm ob lub suab kuj yuav sib txawv.
Cov lus teb yog C.

Cov nthwv dej ruaj khov (cov nthwv dej sawv ntsug)

5. Ib txoj hlua uas ob sab kawg raug clamped tsim ib lub suab nrov nrog lub zaus ntawm 420 Hz. Cov zaus ntawm peb lub overtones yog….

1. 840 Hz
2. 1260 Hz
3. 1680 Hz
4. 2940 Hz

Kev Sib Tham
Nws paub tias:
Qhov zaus tseem ceeb (f)₁) = 420 Hz
Ob qho kawg ntawm cov xov hlau raug khi
Nug: Qhov zaus ntawm peb lub overtones
Lus teb:
Qhov zaus ntawm lub suab thib ob (f)₂) = 2 f₁ = 2 (420 Hz) = 840 Hz
Qhov zaus ntawm lub suab overtone thib peb (f)₃) = 3 f₁ = 3 (420 Hz) = 1260 Hz
Cov lus teb yog B.

Cov suab nrov

6. Daim duab hauv qab no qhia txog lub tswb hluav taws xob hauv ib lub qhov kaw. Tom qab ntawd lub tswb raug nrov, tso cov pa tawm ntawm lub qhov kaw. Tom qab cov pa tawm ntawm lub qhov kaw, lub suab ntawm lub tswb tsis hnov ​​​​​​dua lawm. Raws li qhov xwm txheej no, nws tuaj yeem xaus lus tias lub suab...

1. tsis tshwm sim hauv qhov chaw kaw
2. nqa los ntawm huab cua los ntawm lub hood
3. tsis tuaj yeem nthuav dav hauv qhov chaw nqus tsev
4. tsis tuaj yeem kis tau los ntawm cov khoom khov

Kev Sib Tham
Suab yog ib nthwv dej uas hla dhau cov khoom khov, cov kua, thiab cov pa roj. Yog tias lub tswb nyob hauv qhov chaw nqus tsev, cov nthwv dej suab yuav tsis tuaj yeem hla dhau ntawm lub tswb mus rau lub pob ntseg ntawm tus mloog.
Cov lus teb yog C.

Qhov chaw nug lus:

Cov Lus Nug Txog Physics OSN hauv Tsev Kawm Ntawv Theem Siab Qib Siab