CHNG : SONG C HOC

SONG C HOC. AM HOC

1. Mot song c hoc co tan so f lan truyen trong moi trng vat chat an hoi vi van toc v, khi o bc song c tnh theo cong thc

A.

B. C. D.

2. Song c hoc lan truyen trong moi trng an hoi vi van toc v khong oi, khi tang tan so song len 2 lan th bc song

A. Tang 4 lanB. Tang 2 lan C. Khong oiD. Giam 2 lan.

3. Van toc truyen song phu thuoc vao

A. Nang lng song.B. Tan so dao ong. C. Moi trng truyen song D. Bc song.

4. Mot ngi quan sat mot chiec phao tren mat bien thay no nho len cao 10 lan trong 18s, khoang cach gia hai ngon song ke nhau la 2m. Van toc truyen song tren mat bien la

A. v = 1m/sB. v = 2m/s C. v = 4m/sD. v = 8m/s.5. Tai iem M cach tam song mot khoang x co phng trnh dao ong uM = 4cos(cm. Tan so cua song la

A. f = 200 Hz.B. f = 100 Hz. C. f = 100 sD. f = 0,01.6. Cho mot song ngang co phng trnh song la u = 8cosmm, trong o x tnh bang cm, t tnh bang giay. Chu k cua song la.

A. T = 0,1 s B. T = 50 s C. T = 8 s D. T = 1 s.7. Cho mot song ngang co phng trnh song la u = 8cosmm,trong o x tnh bang cm, t tnh bang giay. Bc song la

A.

B. C.

D.

8. Mot song truyen tren si day an hoi rat dai vi tan so 500 Hz, ngi ta thay khoang cach gia hai iem gan nhau nhat dao ong cung pha la 80cm. Van toc truyen song tren day la.

A. v = 400 cm/s. B. v = 16 m/s. C. v = 6,25 m/s. D. v = 400 m/s.9. Cho mot song ngang co phng trnh song la u = 5cosmm, trong o x tnh bang cm, t tnh bang giay. V tr cua phan t song M cach goc toa o 3m thi iem t = 2s la

A. uM = 0 mm B. uM = 5 mmC. uM = 5 cm D. uM = 2,5 cm10. Mot song c hoc lan truyen vi van toc 320m/s, bc song 3,2m. Chu k cua song o la

A. T = 0,01 s B. T = 0,1 s C. T = 50 s D. T = 100 s

11. Van toc truyen am trong khong kh la 340m/s, khoang cach gia hai iem gan nhau nhat tren cung mot phng truyen song dao ong ngc pha nhau la 0,85m. Tan so cua am la

A. F = 85 Hz. B. f = 170 Hz. C. f = 200 Hz. D. f = 255 Hz.12. Mot song c hoc co tan so f = 1000 Hz lan truyen trong khong kh. Song o c goi la

A. Song sieu am B. Song am. C. Song ha am. D. Cha u ieu kien ket luan.13. Song c hoc lan truyen trong khong kh vi cng o u ln, tai ta co the cam thu c song c hoc nao sau ay

A. Song c hoc co tan so 10 Hz. B. Song c hoc co tan so 30 kHz.

C. Song c hoc co chu k 2,0. D. Song c hoc co chu k 2,0 ms.

14. Mot song am co tan so 450Hz lan truyen vi van toc 360 m/s trong khong kh. o lech pha gia hai iem cach nhau 1m tren mot phng truyen song la

A. (rad). B. (rad). C. (rad). D. (rad).15. Phat bieu nao sau ay khong ung ?

A. Nhac am la do nhieu nhac cu phat ra. B. Tap am la cac am co tan so khong xac nh.

C. o cao cua am la mot ac tnh cua am. D. Am sac la mot ac tnh cua am.16. Phat bieu nao sau ay la ung ?

A. Am co cng o ln th tai ta co cam giac am o to.

B. Am co cng o nho th tai ta co cam giac am o be.

C. Am co tan so ln th tai ta co cam giac am o to.

D. Am to hay nho phu thuoc vao mc cng o am va tan so am.17. Mot ong tru co chieu dai 1m. mot au ong co mot pit-tong e co the ieu chnh chieu dai cot kh trong ong. at mot am thoa dao ong vi tan so 660 Hz gan au h cua ong. Van toc am trong khong kh la 330 m/s. e co cong hng am trong ong ta phai ieu chnh ong en o dai

A. l =0,75 m B. l = 0,50 m C. l = 25,0 cm D. l = 12,5 cm18. Tieng coi co tan so 1000 Hz phat ra t mot oto ang chuyen ong tieng lai gan ban vi van toc 10 m/s, van toc am trong khong kh la 330 m/s. Khi o ban nghe c am co tan so la

A. f = 969,69 Hz B. f = 970,59 Hz C. f = 1030,30 Hz D. f = 1031,25 Hz.19. Phat bieu nao sau ay la khong ung ? Hien tng giao thoa song ch xay ra khi hai song c tao ra t hai tam song co cac ac iem sau:

A. Cung tan so, cung pha. B. Cung tan so, ngc pha.

C. Cung tan so, lech pha nhau mot goc khong oi. D. Cung bien o cung pha.20. Phat bieu nao sau ay la ung. Hien tng giao thoa song xay ra

A. khi co hai song chuyen ong ngc chieu nhau.

B. co hai dao ong cung chieu, cung pha gap nhau.

C. co hai song xuat phat t hai nguon dao ong cung pha, cung bien o.

D. co hai song xuat phat t hai tam dao ong cung tan so, cung pha.21. Phat bieu nao sau ay la khong ung Khi xay ra hien tng giao thoa song tren mat chat long:

A. ton tai cac iem dao ong vi bien o cc ai. B. ton tai cac iem khong dao ong.

C. cac iem khong dao ong tao thanh cac van cc tieu.

D. cac iem dao ong manh tao thanh cac ng thang cc ai.

22. Trong hien tng dao thoa song tren mat nc, khoang cach gia hai cc ai lien tiep nam tren ng noi hai tam song bang bao nhieu ?

A. Bang hai lan bc song. B. Bang mot bc song.

C. Bang mot na bc song.

D. Bang mot phan t bc song.

23. Trong th nghiem tao van giao thoa song tren mat nc, ngi ta dung nguon dao ong co tan so 50 Hz va o c khoang cach gia hai gn song lien tiep nam tren ng noi hai tam dao ong la 2 mm. Bc song cua song tren mat nc la bao nhieu ?

A. mm B. mm C. mm D. mm.

24. Trong th nghiem tao van giao thoa song tren ma75t nc, ngi ta dung nguon dao ong co tan so 100 Hz va o c khoang cach gia hai gn song lien tiep nam tren ng noi hai tam dao ong la 4 mm. Van toc song tren mat nc la bao nhieu ?

A. v = 0,2 m/s B. v = 0,4 m/s. C. v = 0,6 m/s. D. v = 0,8 m/s.

25. Trong th nghiem giao thoa song tren mat nc, hai nguon ket hp A, B dao ong vi tan so 20 Hz, tai mot iem M cach A va B lan lt la 16cm va 20cm, song co bien o cc ai, gia M va ng trung trc cua AB co 3 day cc ai kha. Van toc truyen song tren mat nc la bao nhieu ?

A. v = 20 cm/s B. v = 26,7 cm/s C. v = 40 cm/sD. v = 53,4 cm/s

26. Trong th nghiem giao thoa song tren mat nc, hai nguon ket hp A,B dao ong vi tan so f = 16 Hz. Tai mot iem M cach cac nguon A, B nhng khoang d1 = 30 cm, d2 = 25,5 cm, song co bien o cc ai. Gia M va ng trung trc co 2 day cc ai khac. Van toc truyen song tren mat nc la:

A. v = 24 m/sB. v = 24 cm/s C. v = 36 m/s D. v = 36 m/s

27. Trong th nghiem giao thoa song tren mat nc, hai nguon ket hp A, B dao ong vi tan so f = 13 Hz. Tai mot iem M cach cac nguon A, B nhng khoang d1=19cm, d2 = 21cm, song co bien o cc ai. Gia M va ng trung trc khong co day cc ai khac. Van toc truyen song tren mat nc la:

A. v = 26 m/sB. v = 26 cm/s C. v = 52 m/s D. v = 52 cm/s.

28. Am thoa ien gom hai nhanh dao ong vi tan so 100 Hz, cham vao mat nc tai hai iem S1, S2. Khoang cach S1S2 = 9,6cm. Van toc truyen song nc la 1,2m/s. Co bao nhieu gn song trong khoang gia S1vaS2 ?

A. 8 gn song B. 14 gn song. C. 15 gn song D. 17 gn song.

29. Phat bieu nao sau ay la ung ? Khi co song dng tren day an hoi th:

A. tat ca cac iem tren day ieu dng lai khong dao ong.

B. nguon phat song ngng dao ong con cac iem tren day van dao ong.

C. tren day co cac iem dao ong manh xen ke vi cac iem ng yen.

D. tren day ch con song phan xa, con song ti b triet tieu.

30. Hien tng song dng tren day an hoi, khoang cach gia hai nut song lien tiep bang bao nhieu ?

A. Bang hai lan bc song. B. Bang mot bc song.

C. Bang mot na bc song. D. Bang mot phan t bc song.31. Mot day an dai 40 cm, can hai au co nh, khi day dao ong vi tan so 600 Hz ta quan sat tren day co song dng vi hai bung song. Bc song tren day la: A. cm B. cm C. cm D. cm

32. Mot day an dai 40cm,hai au co nh, khi day dao ong vi tan so 600Hz ta quan sat tren day co song dng vi hai bung song. Van toc song tren day la

A. v = 79,8m/s B. v = 120 m/s C. v = 240m/s D. v = 480m/s.

33. Day AB can nam ngang dai 2m, hai au A va B co nh, tao mot song dng tren day vi tan so 50Hz, tren oan AB thay co 5 nut song. Van toc truyen song tren day la

A. v = 100 m/sB. v = 50 m/s C. v = 25 cm/sD. v = 12,5 cm/s.34. Mot ong sao dai 80 cm, h hai au, tao ra mot song ng trong ong sao vi am la cc ai hai au ong, trong khoang gia ong sao co hai nut song. Bc song cua am la

A. cmB. cm C. cmD. cm.

35. Mot si day an hoi dai 60 cm, c rung vi tan so 50 Hz, tren day tao thanh mot song dng on nh vi 4 bung song, hai au la hai nut song. Van toc song tren day la

A. v = 60 cm/sB. v = 75 cm/ s C. v = 12 m/s D. v = 15 m/s.

36. Mot song c hoc lan truyen tren si day an hoi, trong khoang thi gian 6 s song truyen c 6m. Van toc truyen song tren day la bao nhieu ?

A. v = 1 mB. v = 6 m C. v = 100 cm/s D. v = 200 cm/s

37. Mot song ngang lan truyen tren mot day an hoi rat dai, au O cua si day dao ong theo phng trnh u = 3,6cos(cm, van toc song bang 1 m/s. Phng trnh dao ong cua mot iem M tren day cach O mot oan 2m la

A. uM = 3,6 cos ()cm B. uM = 3,6sin()cm

C. uM = 3,6cos)cm D. uM = 3,6sin()cm

38. au O cua mot si day an hoi nam ngang dao ong ieu hoa theo phng thang ng vi bien o 3 cm vi tan so Hz. Sau 2 s song truyen c 2m. Chon goc thi gian la luc iem O i qua VTCB theo chieu dng. Li o cua iem M cach O mot khoang 2 m tai thi iem 2s la

A. xM = 0 cm B. xM = 3 cm C. xM = -3 cm D. xM = 1,5 cm

39. Trong mot th nghiem ve giao thoa song tren mat nc, hai nguong song ket hp S1 va S2 dao ong vi tan so 15 Hz. Van toc truyen song tren mat nc la 30 cm/s. Vi iem M co nhng khoang d1, d2 nao di ay se dao ong vi bien o cc ai ?

A. d1 = 25 cm va d2 = 20 cm. B. d1 = 25 cm va d2 = 21 cm.

C. d1 = 25 cm va d2 = 22 cm. D. d1 = 20 cm va d2 = 25 cm.

40. Tai mot iem A nam cach nguon am N (Nguon iem )mot khoang NA = 1 m, co mc cng o am la LA = 90 dB. Biet ngng nghe cua am o la I0 = 0,1n W/m2. Cng o cua am o tai A la:

A. IA = 0,1 nW/m2. B. IA = 0,1 mW/m2. C. IA = 0,1 W/m2. D. IA = 0,1 GW/m2.

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