Maqhubu a emang - mathata le litharollo

Maqhubu a emang - mathata le litharollo

1. Thapo ea limithara tse 3 e tlameletsoe pheletsong e 'ngoe 'me pheletso e 'ngoe e hokahantsoe le vibrator. Ha vibrator e thothometsoa, ​​khoele e etsa leqhubu le sa sisinyeheng , joalo ka ha ho bontšitsoe setšoantšong se ka tlase.

Fumana sebaka sa antinode ea bohlano ho tloha pheletsong e tsitsitseng.

Tharollo:

Sebaka se pakeng tsa li-node tse peli = limithara tse 3 / 5 = limithara tse 3/5.

Sebaka se pakeng tsa leqhubu la pele le pheletso e tsitsitseng = 3/5 metres

Sebaka se pakeng tsa leqhubu la bobedi le pheletso e tsitsitseng = 2 (limithara tse 3/5) = limithara tse 6/5

Sebaka se pakeng tsa leqhubu la boraro le pheletso e tsitsitseng = 3 (limithara tse 3/5) = 9/5 limithara

Sebaka se pakeng tsa node ea bone le pheletso e tsitsitseng = 4 (limithara tse 3/5) = limithara tse 12/5

Sebaka se pakeng tsa node le antinode = 1/2 (limithara tse 3/5) = 3/10 limithara.

Sebaka se pakeng tsa antinode ea bohlano le pheletso e tsitsitseng = sebaka se pakeng tsa node ea bone le pheletso e tsitsitseng + sebaka se pakeng tsa node le antinode = 12/5 + 3/10 = 24/10 + 3/10 = 27/10 = limithara tse 2.7.

2. Jwalo ka ha ho bontshitswe setshwantshong se ka tlase, pheletso e nngwe e hokahantswe le vibrator mme pheletso e nngwe e tsitsitse. Haeba bolelele ba thapo e le dimithara tse 1.5, fumana sebaka se pakeng tsa node ya bone le vibrator.

Tharollo:

Sebaka se pakeng tsa li-node tse peli = 1.5 metres / 11 = 1.5 / 11 metres.

Sebaka se pakeng tsa node ea pele le vibrator = 1.5 / 11 metres

Sebaka se pakeng tsa node ea bobeli le vibrator = 2 (1.5 / 11 metres) = 3/11 metres

Sebaka se pakeng tsa node ea boraro le vibrator = 3 (1.5 / 11 metres) = 4.5 / 11 metres

Sebaka se pakeng tsa node ea bone le vibrator = 4 (1.5 / 11 metres) = 6/11 metres = 0.54 metres

3. Khoele e na le lipheletso tse peli tse tsitsitseng, e hlahisang molumo oa motheo o nang le maqhubu a 420 Hz. Fumana molumo oa boraro o fetang.

A. 840 Hz

B. 1260 Hz

C. 1680 Hz

D. 2940 Hz

Tse tsejoang:

Lebelo la motheo (f ₁ ) = 420 Hz

Lipheletso ka bobeli li lula li tsitsitse.

Ho batloa: molumo oa boraro o feteletseng

Tharollo:

Molumo oa pele o fetang (f ₂ ) = 2 f ₁ = 2 (420 Hz) = 840 Hz

Molumo oa bobeli o fetang (f ₃ ) = 3 f ₁ = 3 (420 Hz) = 1260 Hz

Molumo oa boraro o fetang (f ₄ ) = 4 f ₁ = 4 (420 Hz) = 1680 Hz

Karabo e nepahetseng ke C.

4. Bophahamo ba bolelele ba modumo o fetang wa pele wa thapo ke 40 cm. Haeba lebelo la leqhubu la modumo moyeng e le 340 m/s, fumana modumo o fetang wa boraro.

A. 850 Hz

B. 1600 Hz

C. 1700 Hz

D. 3200 Hz

Tse tsejoang:

Bolelele ba maqhubu a molumo o fetang oa pele (λ) = 40 cm = 0.4 metres

Lebelo la leqhubu la molumo moeeng (v) = limithara tse 340/motsotsoana

Ho batloa: maqhubu a molumo o fetang oa boraro

Tharollo:

Ka tlase ke setshwantsho sa leqhubu le emeng hodima thapo le nang le dipheletso ka bobedi tse tsitsitseng. Taba ya pele, bala bolelele ba thapo o sebedisa bolelele ba leqhubu la leqhubu la pele. Kamora moo, pele o bala maqhubu a leqhubu la boraro, pele, bala bolelele ba leqhubu la leqhubu la boraro.

Bolelele ba maqhubu a molumo oa pele:

Bolelele ba khoele (L) = 2. ½ λ

Bolelele ba khoele (L) = λ

Bolelele ba khoele (L) = 0.4 metres

Bolelele ba maqhubu a molumo o fetang oa boraro:

L = 2 λ

0.4 = 2 λ

λ = 0.4 / 2

λ = limithara tse 0.2

Khafetsa ea molumo o fetang oa boraro:

f = v / λ

f = 340 : 0.2

f = 1700 Hertz

Karabo e nepahetseng ke C.

5. Phaephe e bulehileng lipheletsong ka bobeli e bolelele ba 40 cm e hlahisa molumo oa motheo o nang le maqhubu a 420 Hz. Fumana molumo oa bobeli o fetang.

A. 380 Hz

B. 460 Hz

C. 840 Hz

D. 1260 Hz

Tse tsejoang:

Bolelele ba phaephe (L) = 40 cm = 0.4 metres

Makgetlo a modumo wa motheo (f ₁ ) = 420 Hertz

Ho batloa: Khafetsa ea molumo oa bobeli o fetang (f ₃ )

Tharollo:

Haeba molumo oa motheo (f ₁ ) = 420 Hertz joale molumo oa bobeli o fetang (f ₃ ) = 3 f ₁ = 3 (420 Hertz) = 1260 Hertz

Karabo e nepahetseng ke D.

6. Leqhubu la molumo phaepheng e koetsoeng le na le paterone ea leqhubu e tšoanang le…

A. Ho ata ha maqhubu khoeleng

B. Ho ata ha maqhubu kholomong ea moea

C. Letsoko le emeng hodima thapo le khomaretsweng pheletsong e 'ngoe

D. Letsoko le emeng hodima thapo le khomaretsweng dipheletsong ka bobedi

Tharollo:

Phaephe e koetsoeng ke phaephe e bulehileng pheletsong e 'ngoe empa e koetsoe ka lehlakoreng le leng, joalo ka ha ho bontšitsoe setšoantšong se kaholimo.

Karabo e nepahetseng ke C.

Lipotso le likarabo tse 20 tse amanang le maqhubu a emeng:

1. Potso: Leqhubu le emeng ke eng?

Karabo: Leqhubu le emeng ke mohlala oa leqhubu o bonahalang o lula o sa sisinyehe, o nang le li-node le li-antinode, tse bakoang ke tšitiso ea maqhubu a mabeli a tsamaeang ka mahlakoreng a fapaneng.

2. Potso: Li-node le li-antinode li fapane joang?

Karabo: Maqhubu ke lintlha tsa bophahamo ba lefela, moo leqhubu le dulang le phomotse, ha maqhubu a antinode e le lintlha tsa bophahamo bo phahameng ka ho fetisisa.

3. Potso: Na maqhubu a emeng a ka bopeha ka mokhoa ofe kapa ofe?

Karabo: Maqhubu a emeng a ka bopeha moyeng ofe kapa ofe o dumellang ho ata ha maqhubu, jwalo ka dithapo, dipilara tsa moya le metsi.

4. Potso: Maqhubu a leqhubu le emeng a amana jwang le palo ya lona e utlwanang?

Karabo: Leqhubu la motheo (harmonic ea pele) ke leqhubu le tlaase ka ho fetisisa la leqhubu le emeng. Liharmonic tse phahameng li na le maqhubu a mangata a kakaretso a leqhubu la motheo.

5. Potso: Ke eng e khethollang libaka tsa li-node leqhubung le emeng?

Karabo: Maqhubu a thehoa moo maqhubu a tsamayang ka mahlakoreng a fapaneng a sitisanang ka tsela e senyang, a hlakolanang.

6. Potso: Maqhubu a emeng a bōptjoa joang khoeleng e khomaretsoeng lipheletsong ka bobeli?

Karabo: Ha leqhubu le tsamayang thapong le bonahatsa pheletsong e tsitsitseng, le sitisa maqhubu a kenang, le etsa mohlala wa leqhubu le emeng haeba maqhubu a tsamaellana le maemo a itseng.

7. Potso: Kamano ke efe pakeng tsa bolelele ba leqhubu le bolelele ba sebaka se mahareng leqhubung le emeng?

Karabo: Bakeng sa khoele e tsitsitseng lipheletsong ka bobeli, bolelele ba seaplane ke palo e felletseng ea halofo ea bolelele ba leqhubu le emeng.

8. Potso: Ke hobane'ng ha maqhubu a emeng a sa fetisetse matla ho pholletsa le seaplane?

Karabo: Leha dikarolwana ka bonngoe tse mahareng di sisinyeha, paterone ya maqhubu ka kakaretso e dula e eme, kahoo ha ho na phetisetso ya matla a sebele ka lehlakoreng lefe kapa lefe le itseng.

9. Potso: Na o ka bona maqhubu a emeng ka hara diphaephe tse bulehileng?

Karabo: E, maqhubu a emeng a ka thehoa ka har'a lipeipi tse bulehileng, empa maemo a moeli a fapana le lipeipi tse koetsoeng, a amang maemo a li-node le a antinode.

10. Potso: Ho etsahala'ng ka leqhubu le emeng ha tsitsipano khoeleng e eketseha?

Karabo: Ho eketsa kgatello ho eketsa lebelo la leqhubu, e leng se ka fetolang maqhubu le paterone ya leqhubu le emeng.

11. Potso: Ho phahama ha molumo ho amana joang le maqhubu a emeng?

Karabo: Ho thothomela ho etsahala ha matla a kantle kapa ho thothomela ho tsamaisana le maqhubu a tlhaho a sistimi, ho etsa leqhubu le emeng le hlahelletseng.

12. Potso: Maqhubu a motheo ke afe?

Karabo: Leqhubu la motheo, kapa harmonic ea pele, ke leqhubu le tlase ka ho fetisisa leo sistimi e ka tšehetsang leqhubu le emeng ka lona.

13. Potso: Melumo e feteletseng e amana joang le li-harmonics?

Karabo: Melumo e fetang tekano ke maqhubu a kaholimo ho maqhubu a motheo. Molumo o fetang tekano oa pele o tsamaellana le harmonic ea bobeli, molumo o fetang tekano oa bobeli le harmonic ea boraro, jj.

14. Potso: Ke hobane'ng ha ho se na ho falla ha li-node?

Karabo: Li-nodeng, maqhubu a mabeli a sitisang a tsoa mohatong ka 180°, e leng se fellang ka tšitiso e senyang le ho se falle ho hang.

15. Potso: Na maqhubu a emeng a ka aroloa?

Karabo: Maqhubu a emeng khoeleng a tshekaletse mme ka hona a na le tsela ya ho sisinyeha (polarization). Leha ho le jwalo, moyeng o kang moya, maqhubu a modumo a emeng a bolelele ba nako e telele mme ha a bontshe polarization.

16. Potso: Ke hobane'ng ha liletsa tsa 'mino li sebelisa molao-motheo oa maqhubu a emeng?

Karabo: Liletsa tsa 'mino hangata li hlahisa molumo ka ho etsa maqhubu a emeng, ka li-harmoniki tse fapaneng tse hlahisang linoto tse fapaneng tsa 'mino.

17. Potso: Lebelo la maqhubu le amana jwang le maqhubu le bolelele ba maqhubu a leqhubu le emeng?

Karabo: Lebelo la maqhubu (v) ke sehlahisoa sa maqhubu (f) le bolelele ba maqhubu (λ): v = fx λ.

18. Potso: Na maqhubu a mabeli a fapaneng a ka hlahisa maqhubu a emeng ka mokhoa o le mong?

Karabo: E, ha feela maqhubu a tsamaellana le maemo a maqhubu a emeng mokerong oo. Maqhubu ka 'ngoe a emela harmonic e fapaneng.

19. Potso: Maqhubu a emeng ka har'a lipeipi tse koetsoeng a fapana joang le a ka har'a lipeipi tse bulehileng?

Karabo: Liphaepheng tse koetsoeng, pheletso e 'ngoe e na le node ha pheletso e 'ngoe e na le antinode. Liphaepheng tse bulehileng, lipheletso ka bobeli li na le antinode.

20. Potso: Na maqhubu a emeng a ka thehoa ka maqhubu afe kapa afe moyeng o fanoeng?

Karabo: Tjhe, ke maqhubu a itseng feela a fihlelang maemo a moedi a tla hlahisa maqhubu a emeng.

Ho utloisisa maqhubu a emeng ho bohlokoa haholo mafapheng a fapaneng, ho tloha 'minong ho ea ho likhokahano tsa mohala, kaha a emela mekhoa ea motheo ea maqhubu tlas'a maemo a itseng.