1. Pambuyo poti foloko yosinthira A yagwedezeka, foloko yosinthira B imagwedezeka. Foloko yosinthira B imagwedezeka chifukwa…..
A. Foloko yosinthira A ili ndi mphamvu yofanana ndi foloko yosinthira B
B. Mafoloko onse awiri osinthira amagwiritsa ntchito bokosi lofanana la resonance
C. Foloko yosinthira B ili ndi ma frequency ofanana ndi foloko yosinthira A
D. Kamvekedwe ka mawu opangidwa ndi mafoloko onse awiri ndi ofanana
Anakonza
Pambuyo pogwedezeka, foroko yosinthira A imagwedeza mpweya wozungulira, kotero mpweya umagwedezekanso ndi ma frequency omwewo . Kuphatikiza apo, mpweya umagwedeza foroko yosinthira B. Foloko yosinthira B imagwedezekanso ndi ma frequency achilengedwe, koma kutalika kwa kugwedezeka ndi kochepa, ndipo kugwedezeka sikuoneka. Popeza ma frequency achilengedwe a foroko yosinthira B ndi ofanana ndi ma frequency a kugwedezeka kwa mpweya,
ndipo kuchuluka kwa foloko yosinthira A, ndiye kuti molekyulu ya mpweya imakulitsa kutalika kwa foloko yosinthira B. Foloko yosinthira B imawoneka ngati ikugwedezeka chifukwa kutalika kwake kwa kugwedezeka kumaonekera.
Yankho lolondola ndi C.
2. Chubu choyatsira mpweya chimapanga phokoso lalikulu nthawi yoyamba pamene kutalika kwa mzati wa mpweya kuli 17 cm ndipo phokoso lalikulu nthawi yachiwiri pamene kutalika kwa mzati wa mpweya kuli 51 cm. Ma frequency a forogo ogwiritsidwa ntchito ndi 500 Hz. Dziwani liwiro la mpweya mu chubu.
A. 138 m/s
B. 230 m/s
C. 340 m/s
D. 461 m/s
Yankho:
Mawonekedwe a chubu cha resonance ndi akuti mbali imodzi ndi yotseguka, ndipo mbali inayo ndi yotsekedwa, kotero mtunda pakati pa node ndi anti-node = kutalika kochepa kwa chubu = ¼ λ = λ / 4.
Chiyerekezo cha kutalika kwa chubu:
Mtunda pakati pa node ndi node yotsutsana ndi chubu cha resonance ndi mbali imodzi umatsegulidwa, ndipo mbali ina imatsekedwa, zomwe zimakwaniritsidwa pamene n ndi nambala yosamvetseka
Yankho lolondola ndi C.
3. Kumveka koyamba mu chubu cha kumveka kumachitika pamene kutalika kwa mzati wa mpweya kuli masentimita 20. Kumveka kwachiwiri ndi kumveka kwachitatu kumachitika pamene kutalika kwa mzati wa mpweya kuli…
A. 40 cm ndi 60 cm
B. 30 cm ndi 40 cm
C. 60 cm ndi 100 cm
D. 100 cm ndi 200 cm
Zodziwika:
Kutalika kwa mzati wa mpweya ngati n 1 = 1 (L 1 ) = 0.2 m
Kufunidwa: Kutalika kwa mzati wa mpweya ngati n 2 = 3 ndipo n 3 = 5
Yankho:
Chiyerekezo cha kutalika kwa chubu (chiyerekezo cha kutalika kwa mzati wa mpweya):
Gwiritsani ntchito equation iyi kuti muwerengere kutalika kwa mafunde pogwiritsa ntchito deta yomwe ili pamwambapa:
Kutalika kwa mzati wa mpweya pamene n 2 = 3 :
Yankho lolondola ndi C.
