Izibonelo eziyi-12 zamagagasi ashintshashintshayo
1. Isibalo segagasi eliphambene elisakazeka ku-string ngu-y = 3 sin π (120 t – 0,4 x). Uma u-x no-y beku-cm kanti u-t kungemizuzwana, khona-ke ubude be-wavelength bungu- ….
A. 1 cm
B. 2 cm
C. 3 cm
D. 4 cm
E. 5 cm
Ingxoxo:
Amafomu amathathu umsebenzi wamagagasi okusabalala ohlangothini lwe-x-axis oluhle (ngakwesokudla).
Imininingwane:
A = ubukhulu noma ukuphambuka, T = imvamisa, f = isikhathi samagagasi, = ubude besikhathi, v = isivinini samagagasi
I-Diketahui :
Isibalo segagasi eliguqukayo
Ukuphakama kwamagagasi (A) :
A = 3 cm
Imvamisa yamagagasi (f) :
t / T = tf = 60 t
f = 60 hertz
Ubude begagasi :
Kubuziwe :
Ubude begagasi?
Jawab :
Ubude bamagagasi = 5 cm
Impendulo efanele ngu-E.
2. Igagasi elihambayo elisakazeka ekugcineni okuqinile kwentambo liboniswa njengakumdwebo ongezansi:
Uma ibanga elingu-AB = amamitha angu-3 limbozwe ngomzuzwana owodwa, khona-ke isibalo segagasi eliphambene elisakazeka ngakwesokudla...
A. y= 0,4 isono π (3 t – x) m
B. y= 0,4 sin π (3 t + x/2) m
C. y= 0,4 sin π (6 t – x/4) m
D. y= 0,8 isono π (4 t – x/3) m
E. y= 0,8 isono π (4 t + x/3) m
I-Diketahui :
Kubuziwe :
Isilinganiso samagagasi?
Jawab :
Impendulo efanele ngu-A.
Ijubane lokusabalala kwamagagasi ajikelezayo entanjeni
3. Kusukela kumanani alandelayo,
(1) Amandla okucindezela intambo
(2) Isisindo ngeyunithi ngayinye ubude bentambo
(3) Indawo enqamula intambo
(4) Umbala wentambo
Ubuningi obuyizinto ezithonya isivinini sokusabalala kwamagagasi entanjeni...
A. (1) kanye no-(2)
B. (1) kanye no-(4)
C. (2) kanye no-(4)
D. (3) kanye (4)
E. (1) kuphela
Ingxoxo
Ifomula yesivinini sokusabalala kwamagagasi entanjeni:
Izici ezithonya isivinini sokusabalala kwamagagasi entanjeni yilezi:
1. Amandla okucindezela intambo (F)
2. Isisindo ngeyunithi ngayinye ubude bentambo ( )
Impendulo efanele ngu-A.
Isibalo segagasi elihambayo elihambayo
4. Isithombe esingezansi sibonisa ukusabalala kwamagagasi entanjeni.
Uma isikhathi samagagasi singamasekhondi ama-2, khona-ke i-wave equation...
A. y = 0,5 sin 2π (t - 0,5x)
B. y = 0,5 sin 2π (t - 0,5x)
C. y = 0,5 sin 2π (t - x)
D. y = 0,5 sin 2π (0,5t – x/4)
E. y = 0,5 sin 2π (t – x/6)
Ingxoxo
Kuyaziwa ukuthi:
Ukuphakama (A) = amamitha angu-0,5
Inkathi (T) = imizuzwana eyi-2
Imvamisa (f) = 1/T = ½ = 0,5 hertz
Ubude bamagagasi = λ = amamitha angu-4
Kubuziwe: i-wave equation
Impendulo:
Izinhlobo ezintathu zemisebenzi/izilinganiso zamagagasi :
y = A isono (ωt – kx) ——> 1
ω = 2π / T kanye no-k = 2π / λ
y = Isono (2π/T) t – (2π/λ) x
y = A isono 2π (t/T – x/λ) ——-> 2
T = 1/f kanye no-λ = v/f
y = A isono 2π (ft – f(x/v))
y = A isono 2πf (t – x/v) ——-> 3
I-wave equation ifana nesithombe esingenhla:
y = Isono (πt – 0,5πx) ——-> 1
y = A sin π (t – 0,5x)
y = Isono 2π (0,5t – x/4) ——-> 2
Impendulo efanele ngu-D.
5.
Cabanga ngegagasi elihambayo elenzeka entanjeni njengoba kuboniswe esithombeni esingezansi! Uma igagasi lihamba ngesivinini esingu-30 m/s, imvamisa yegagasi…
I-A. 150 Hz
B. 90 Hz
C. 25 Hz
D. 10 Hz
Ingxoxo
Kunezintaba zamagagasi amathathu kanye nezigodi zamagagasi ezimbili ngakho-ke kunezingqimba zamagagasi ezingu-2,5. Ngakho ubude begagasi obu-1 = amamitha angu-7,5 / 2,5 = amamitha angu-3
Kuyaziwa ukuthi:
Ubude begagasi (i-lambda) = 7,5 / 2,5 = amamitha angu-3
Isivinini sokusabalala kwamagagasi (v) = 30 m/s
Kubuziwe: imvamisa yamagagasi (f)
Impendulo:
Impendulo efanele ngu-D.
6.
Ingane inyakazisa intambo ukuze idale igagasi elifana naleli eliboniswe esithombeni. Uma isikhathi esithathwa ukuhamba ukusuka ku-P kuya ku-X singu-10 imizuzwana, khona-ke ijubane legagasi...
A. 3,0 m/s
B. 1,5 m/s
C. 0,5 m/s
D. 0,3 m/s
Ingxoxo
– Kunezinsika ezimbili kanye nezinsika ezimbili, ngakho-ke kunezinsika ezimbili zamaza. Uma izinsika ezimbili zamaza zihamba ngemizuzwana eyi-10, khona-ke ubude obulodwa bamaza buhamba ngemizuzwana emi-5.
– Ibanga lama-wavelength amabili lingamamitha ama-3, ngakho-ke ibanga lama-wavelength angu-1 lingamamitha ayi-1,5.
Kuyaziwa ukuthi:
Ubude begagasi (i-lambda) = 3 / 2 = amamitha angu-1,5
Isikhathi samagagasi (T) = imizuzwana emi-5
Imvamisa yamagagasi (f) = 1/T = 1/5 = 0,2 Hertz
Kubuziwe: isivinini sokusabalala kwamagagasi (v)
Impendulo:
Isivinini sokusabalala kwamagagasi :
Impendulo efanele ngu-D.
7.
Intambo iyanyakaziswa ukuze yakhe amagagasi njengoba kuboniswe esithombeni esilandelayo! Igagasi likhula ngokushesha kangakanani?
A. 0,5 m/s
B. 1 m/s
C. 2 m/s
D. 4 m/s
Ingxoxo
– Kunezintaba ezimbili zamagagasi kanye nesigodi esisodwa samagagasi ngakho-ke kunezingqimba zamagagasi ezingu-1,5
– ubude obungu-1 = ibanga eliphakathi kwama-crests amabili amagagasi aseduze = ibanga eliphakathi kwama-wave throws amabili aseduze. Ngakho-ke, ubude obungu-1 = amamitha angu-2,0
– I-wave crest eyodwa ithatha imizuzwana engu-0,25 kanti i-wave trough eyodwa ithatha imizuzwana engu-0,25, ngakho-ke ubude be-wavelength obu-1 buthatha imizuzwana engu-0,50. Ngakho isikhathi se-wave = imizuzwana engu-0,50.
Kuyaziwa ukuthi:
Ubude begagasi (i-lambda) = amamitha angu-2,0
Isikhathi samagagasi (T) = imizuzwana emi-0,50
Imvamisa yamagagasi (f) = 2 Hertz
Umbuzo: Isivinini sokusabalala kwamagagasi (v)
Impendulo:
Isivinini sokusabalala kwamagagasi :
Impendulo efanele ngu-D.
8. Igagasi eliphambene linesikhathi semizuzwana eyi-10 kanti ibanga eliphakathi kwamaphuzu amabili alandelanayo esigabeni lingu-10 cm. Ijubane lokusabalala kwegagasi...
A. 1 cm/s
B. 2 cm/s
C. 3 cm/s
D. 4 cm/s
E. 5 cm/s
Ingxoxo:
I-Diketahui :
Inkathi (T) = imizuzwana eyi-10
Ubude begagasi () = 10 cm
Kubuziwe :
Isivinini sokusabalala kwamagagasi (v) ?
Jawab :
Ifomula yesivinini sokusabalala kwamagagasi :
Impendulo efanele ngu-A.
9. Ijubane legagasi eliphambeneyo entanjeni = 2v kanye nokucindezeleka kwalo = 3F. Uma ubude kanye nobunzima bentambo kuhlala kungaguquguquki, kuyilapho ukucindezeleka entanjeni kukhushulwa ku-6F, khona-ke ijubane legagasi entanjeni liba...
A. 8v
B. 2v
C. 2√2
D. v
E. ½ v
Ingxoxo:
I-Diketahui :
Isivinini segagasi eliguqukayo 1 (v)1) = 2v
Ukuqina kwentambo 1 (T)1) = 3F
Ukuqina kwentambo 2 (T)2) = 6F
Kubuziwe :
Isivinini segagasi eliguqukayo 2 (v)2)?
Jawab :
Ifomula yesivinini sokusabalala kwamagagasi adlulayo entanjeni :
Impendulo efanele ngu-C.
10. Amakhokho amabili aphezu kwemigqa yamagagasi ephambene. Ahamba phezulu naphansi phezu kolwandle izikhathi ezingama-20 ngemizuzwana emi-4, elandela amagagasi. Uma ibanga phakathi kwamakhokho amabili lingu-100 cm futhi kunezigodi ezimbili negquma elilodwa phakathi kwawo, khona-ke imvamisa yamagagasi kanye nesivinini samagagasi...
A. 0,2 Hz kanye nama-200 cm.s-1
B. 5,0 Hz kanye nama-200 cm.s-1
C. 0,2 Hz kanye nama-250 cm.s-1
D. 2,5 Hz kanye nama-250 cm.s-1
I-E. 5,0 Hz kanye ne-250 cm.s-1
Ingxoxo
I-Diketahui :
Amakhoki amabili aseziqongweni zamagagasi, futhi phakathi kwawo kunezigodi ezimbili negquma elilodwa (bheka isithombe). Ngakho-ke, kunezingqimba ezimbili zamaza phakathi kwamakhoki amabili.
Ubude begagasi (λ) = 100 cm / 2 = 50 cm.
Imvamisa (f) = 20/4 = 5 Hertz
Kubuziwe : imvamisa yamagagasi kanye nesivinini sokusabalala kwamagagasi
Jawab :
Imvamisa yamagagasi (f) = 5 Hertz
Isivinini sokusabalala kwamagagasi (v) = f λ = (5)(50 cm) = 250 cm/s
Impendulo efanele ngu-E.
11. Isipilingi (esinqenqemeni) siyanyakaziswa ukuze sikhiqize igagasi elide elinebanga elingama-40 cm phakathi kokucindezelwa okubili okuseduze. Uma ijubane lokusabalala kwamagagasi lingu-20 ms -1 , khona-ke ubude begagasi kanye nemvamisa yalo...
A. 0,2 m kanye ne-100 Hz
B. 0,4 m kanye no-50 Hz
C. 0,8 m kanye no-25 Hz
D. 40 m kanye ne-0,50 Hz
E. 80 m kanye no-0,25 Hz
Ingxoxo
I-Diketahui :
Ibanga eliphakathi kokucindezelwa okubili okuseduze noma ibanga eliphakathi kwezinhlobo ezimbili eziseduze noma ibanga eliphakathi kweziqongo ezimbili eziseduze noma ibanga eliphakathi kwezigodi ezimbili eziseduze = ubude obungu-1.
Ubude bamagagasi (λ) = 40 cm = 0,4 amamitha
Isivinini sokusabalala kwamagagasi (v) = 20 m/s
Kubuziwe : Ubude begagasi (λ) kanye nemvamisa yamagagasi (f)
Jawab :
Ubude begagasi (λ) = amamitha angu-0,4
Imvamisa yamagagasi (f) = v / λ = 20 / 0,4 = 50 Hertz
Impendulo efanele ingu-B.
12. Ebusweni bolwandle, kunezikhokho ezimbili ezihlukaniswe ngamasentimitha angu-60. Zombili ziyaphakama futhi zehle ngezinga lolwandle izikhathi ezingu-20 ngemizuzwana eyi-10. Uma eyodwa iphezulu kwegagasi, enye iphansi kwethangi. Ngenkathi phakathi kwezikhokho ezimbili kukhona i-wave crest, khona-ke isikhathi segagasi kanye nesivinini segagasi...
A. 0,5 s kanye no-20 cm.s-1
B. 0,5 s kanye no-30 cm.s-1
C. 0,5 s kanye no-80 cm.s-1
D. 2 s kanye no-120 cm.s-1
E. 2 s kanye no-240 cm.s-1
Ingxoxo
I-Diketahui :
Ubude begagasi (λ) = 60 cm / 1,5 = 40 cm
Imvamisa (f) = 20/10 = 2 Hertz
Kubuziwe : Isikhathi samagagasi kanye nesivinini sokusabalala kwamagagasi
Jawab :
Inkathi (T) = 1/f = 1/2 = 0,5 imizuzwana
Isivinini segagasi (v) = f λ = (2)(40) = 80 cm/s
Impendulo efanele ngu-C.
