Zitsanzo za mafunso ndi njira zowerengera mawu
Mphamvu ya mawu
1. Kuchuluka kwa mphamvu ya phokoso kumasonyeza kuchuluka kwa logarithmic kwa….
- Kuyerekeza pakati pa mphamvu pamalo ndi mphamvu yopangidwa ndi gwero la phokoso
- Mphamvu ya phokoso pa gawo lililonse pamwamba pa unit
- Mphamvu ya phokoso lomwe lili patali ndi komwe limachokera
- Kuyerekeza pakati pa mphamvu ya mawu ndi mphamvu ya malire a kumva kwa anthu
Zokambirana
Fomula ya mulingo wa mphamvu ya mawu:
Kufotokozera kwa fomula: TI = mulingo wa mphamvu, I = mphamvu ya phokoso, Io = mphamvu ya kumva kwa anthu = 10-12 W / m2
Kutengera ndi njira yomwe ili pamwambapa, zitha kutsimikizika kuti mulingo wa mphamvu ya phokoso umafotokoza kuchuluka kwa logarithmic kwa kufananiza mphamvu ya phokoso ndi mphamvu ya malire a kumva kwa munthu.
Yankho lolondola ndi D.
2. Mphamvu ya phokoso ndi 6 x 10 -6 W/cm2 . Ngati mphamvu ya phokoso yawonjezeka ndi 10 dB, ndiye kuti mphamvu ya phokoso imakhala….
- 6 × 10-5 W / masentimita2
- 6 × 10-7 W / masentimita2
- 3 × 10-6 W / masentimita2
- 12 × 10-6 W / masentimita2
Zokambirana
Amadziwika kuti:
Mphamvu (I) = 6 x 10-6 W / masentimita2
Mphamvu ya malire (I)o= = 10-12 W / m2 = 10-12 W / 104 cm2 = 10-16 W / masentimita2
Anafunsa kuti: Ngati TI yawonjezeka ndi 10 dB ndiye kuti ndimakhala….
Yankho:
Kuwonjezeka kwa mphamvu ya mawu ndi 10 W/m2 = 10-3 W / masentimita2 zofanana ndi kukweza mphamvu ya mawu ndi 10 dB.2 W / m2 = 10-2 W / masentimita2 zofanana ndi kukweza mulingo wa mphamvu ya mawu ndi 20 dB. Ndi zina zotero.
Ngati mphamvu yawonjezeka ndi 10 dB, ndiye kuti mphamvu yawonjezeka ndi 10-3 W / masentimita2Kotero mphamvu imakhala (6 x 10-6 W / masentimita2) + (10-4 W / masentimita2) = (6 x 10-6 W / masentimita2) + (100 x 10-6 W / masentimita2) = 100 x 10-6 W / masentimita2.
Palibe yankho lolondola.
Kumveka kwa mafunde a phokoso
3. Yang'anani chithunzi chotsatirachi!
Pambuyo poti foroko yokonza A yagwedezeka ndi chogwirira, foroko yokonza B imagwedezekanso. Chochitikachi chimachitika chifukwa….
- Foloko yosinthira A ili ndi kukula kofanana ndi foloko yosinthira B
- Mafoloko onse awiri osinthira magetsi amagwiritsa ntchito bokosi lofanana la resonance.
- Foloko yosinthira B ili ndi ma frequency ofanana ndi foloko yosinthira A
- Mtundu wa mawu omwe amapangidwa ndi ma tuning fork onsewa ndi wofanana.
Zokambirana
Pambuyo pogwedezeka ndi chogwirira, tuning fork A imagwedeza mpweya wozungulira kuti mpweya nawonso ugwedezeke ndi ma frequency omwewo. Kenako mpweya umagwedezeka tuning fork B. Tuning fork B kwenikweni imagwedezeka ndi ma frequency ake achilengedwe koma ma vibration amplitude ake ndi ochepa kwambiri ndipo vibration yake siingaoneke ndi diso. Chifukwa ma frequency achilengedwe a tuning fork B ndi ofanana ndi ma vibration amplitude ...
Yankho lolondola ndi C.
4. Chubu choyatsira mpweya chimapanga phokoso lalikulu kwa nthawi yoyamba pamene kutalika kwa mzati wa mpweya kuli 17 cm ndi phokoso lalikulu la phokoso kwa nthawi yachiwiri pamene kutalika kwa mzati wa mpweya kuli 51 cm. Ngati kuchuluka kwa foloko yosinthira yomwe imagwiritsidwa ntchito ndi 500 Hz. Liwiro la kufalikira kwa mpweya mu chubu ndi….
- 138 m / s
- 230 m / s
- 340 m / s
- 461 m / s
Zokambirana
Mawonekedwe a chubu cha resonance ndi akuti mbali imodzi ndi yotseguka ndipo mbali inayo ndi yotsekedwa kotero kuti mtunda pakati pa vertex ndi ma antinode motsatana = kutalika kwa chubu kocheperako = ¼ λ = λ/4.
Fomula ya kutalika kwa silinda:
Mtunda pakati pa mfundo za nodal ndi ma antinode m'machubu otseguka ndi otsekedwa umakwaniritsidwa pamene n ndi nambala yosamvetseka.
Kutalika kwa mafunde a n1 = 1 ndi L = 0,17 mamita:
Kutalika kwa mafunde a n2 = 3 ndi L = 0,51 mamita:
Yankho lolondola ndi C.
Liwiro la mafunde a phokoso
5. Pofuna kuyeza kuya kwa nyanja, sitimayo imatulutsa mafunde a ultrasound kupita pansi pa nyanja. Mafunde owunikira amalandiridwa ndi chowunikira chomwe chili m'sitimayo patatha masekondi 12. Ngati liwiro la mafunde a ultrasound m'madzi ndi 1200 m/s, ndiye kuti kuya kwa nyanja kungaganizidwe kuti ndi….
- 7,2 km pa
- 14,4 km pa
- 21,6 km pa
- 28,8 km pa
Zokambirana
Amadziwika kuti:
Mafunde owonetsedwa amalandiridwa ndi chowunikira chomwe chili m'chombocho m'masekondi 12. Choncho masekondi 12 ndi nthawi yobwerera ndi kubwerera.
Nthawi yopuma (t) = masekondi 12 / 2 = masekondi 6
Liwiro la mafunde a ultrasound m'madzi (v) = 1200 m/s
Anafunsa kuti: Kuzama kwa nyanja
Yankho:
Kuzama kwa nyanja:
s = vt
s = (mamita 1200/sekondi)(masekondi 6) = mamita 7200 = makilomita 7,2
Yankho lolondola ndi A.
6. Kuwomba kwa bingu kumamveka masekondi 8 pambuyo poti mphezi yawoneka. Ngati liwiro la kuwala ndi 3 x 108 m / s ndipo liwiro la phokoso mumlengalenga ndi 340 m / s, ndiye kuti mtunda pakati pa gwero la mphezi ndi womvera ukhoza kuyerekezeredwa kukhala…
- 1,82 km pa
- 2,72 km pa
- 4,25 km pa
- 7,24 km pa
Zokambirana
Amadziwika kuti:
Nthawi yoyenda (t) ya phokoso = masekondi 8
Liwiro la kuwala (v kuwala) = 3 x 108 mamita/sekondi
Liwiro la phokoso mumlengalenga (v phokoso) = 340 mamita/sekondi
Anafunsa kuti: Mtunda pakati pa gwero la mphezi ndi womvera
Yankho:
Liwiro la kuwala ndi lalikulu kwambiri kotero kuti kuwonekera kwa mphezi ndi kuwonekera kwa mphezi kungaganizidwe kuti kumachitika nthawi imodzi.
Mtunda kuchokera ku gwero la mphezi kupita ku womvera:
s = vt = (mamita 340/sekondi)(masekondi 8) = mamita 2720 = 2,72 km
Yankho lolondola ndi B.
7. Pa malo enaake, wowonera amamva kugunda kwa bingu masekondi 16,2 pambuyo poti mphezi yaonekera. Ngati liwiro la kuwala mumlengalenga ndi 3 x 10 8 m/s ndipo liwiro la phokoso mumlengalenga panthawiyo ndi 343 m/s, ndiye kuti mtunda woyerekeza pakati pa malo a mphezi ndi wowonera ndi pafupifupi….
- 5,5 km pa
- 12,5 km pa
- 25 km pa
- 55 km pa
Zokambirana
Amadziwika kuti:
Nthawi yoyenda (t) ya phokoso = masekondi 16,2
Liwiro la kuwala (v kuwala) = 3 x 108 mamita/sekondi
Liwiro la phokoso mumlengalenga (v phokoso) = 343 mamita/sekondi
Anafunsa kuti: Mtunda pakati pa malo a mphezi ndi wowonera
Yankho:
Liwiro la kuwala ndi lalikulu kwambiri kotero kuti kuwonekera kwa mphezi ndi kuwonekera kwa mphezi kungaganizidwe kuti kumachitika nthawi imodzi.
Mtunda kuchokera ku gwero la mphezi kupita ku womvera:
s = vt = (mamita 343/sekondi)(masekondi 16,2) = mamita 5556,6 = 5,5 km
Yankho lolondola ndi A.
Mafunde a phokoso pafupipafupi
8. Noti ya C yopangidwa ndi chingwe cha gitala ndi noti ya C yopangidwa ndi piyano zili ndi zofanana pa izi….
- kuchuluka kwa mawu
- mtundu wa mawu
- kukula kwa mawu
- mphamvu ya mawu
Zokambirana
Noti ya C ya chingwe cha gitala ndi noti ya C ya piyano zimafanana pankhani ya kuchuluka kwa mawu kapena kamvekedwe kake.
Yankho lolondola ndi A.
Kufalikira kwa mafunde a phokoso
9. Masana, mpweya womwe uli pafupi ndi nthaka umakhala ndi kutentha kwakukulu kuposa mpweya womwe uli kutali ndi nthaka. Usiku, zosiyana zimachitika; mpweya womwe uli pafupi ndi nthaka umakhala ndi kutentha kochepa kuposa mpweya womwe uli kutali ndi nthaka. Chifukwa chake…
- Masana, phokoso limakwera kwambiri kuposa mopingasa
- Usiku, phokoso limakwera kwambiri kuposa mopingasa
- Usana kapena usiku, phokoso limayenda mbali zonse.
- Usana ndi usiku, mawu amayenda molunjika kuposa mmwamba
Zokambirana
Masana, mpweya womwe uli pafupi ndi nthaka umakhala ndi kutentha kwakukulu kuposa mpweya womwe uli kutali ndi nthaka. Mwanjira ina, masana, mpweya womwe uli pafupi ndi nthaka umakhala wotentha kwambiri kuposa mpweya womwe uli kutali ndi nthaka. Mpweya wotentha kwambiri umakhala ndi kuchuluka kochepa, kotero umakwera mmwamba mosavuta. Chifukwa chake, masana, mpweya umakwera mmwamba kwambiri. Phokoso limayenda mumlengalenga, ndipo phokoso limayenda mbali zonse. Komabe, chifukwa mpweya umakwera mmwamba kwambiri masana, phokoso limakweranso mmwamba kwambiri.
Mosiyana ndi zimenezi, usiku, mpweya sukwera mmwamba kwambiri, kotero phokoso silikwera mmwamba kwambiri. Ichi ndichifukwa chake mawu akutali amatha kumveka usiku, pomwe mawu akutali ndi ovuta kumva masana.
Yankho lolondola ndi A.
