Mibvunzo yeMienzaniso yeMafungu Eruzha

Mienzaniso gumi nematanhatu yemibvunzo yeSound Wave

1. Muoni ari mumakwikwi emotokari anonzwa ruzha rwakasiyana (ruzha rwemotokari) sezvo motokari dzichisvika uye dzichidzokera shure. Mota yemujaho yemazuva ose inoburitsa ruzha pa800 Hz. Kana kumhanya kweruzha mumhepo kuri 340 m/s,^-1 uye kumhanya kwemotokari ndeye 20 ms^-1, ipapo kanganiko kanonzwika kana mota yasvika….
A. 805 Hz

B. 810 Hz

C. 815 Hz

D. 850 Hz

E. 875 Hz

Kukurukurirana

Zvinozivikanwa kuti:

v_s = -20 m/s (kunge mota iri kufamba kubva kune ari kuteerera)

v_p = 0 (muteereri akanyarara nekuti ari kutarisa)

f = 800 hz

v = 340 m/s

Akabvunzwa: Unonzwa ruzha rwakawanda sei?

Mhinduro:

Mhinduro chaiyo ndiD.

2. Munhu anofamba ne speed ye 10 ms^-1 Kana munhu asvika panobva ruzha rwakamira, ruzha runotenderera 680 Hz. Mushure mekusvika panobva ruzha, munhu anobva panobva ruzha nekumhanya kumwe chete. Kana kumhanya kweruzha mumhepo kuri 340 m/s^-1, ipapo kuenzanisa kwemafrequencies maviri anonzwiwa kana uchienda kunobva nepaunenge uchibva kunobva ndiko...

A.///

B. 33/35

C. 34/35

D. 35/33

E. 35/34

Kukurukurirana

Zvinozivikanwa kuti:

v = 340 m/s

v_p = 10 m/s

v_s = 0

f = 680 hz

Mubvunzo: Chii chinoitika kana muteereri akasvika panzvimbo inonzwika muteereri achisiya nzvimbo yacho?

Mhinduro:

Muteereri anobva panobva shoko:

Kuenzanisa kwemafrequencies anonzwiwa:

700 : 660 = 70 : 66 = 35 : 33

Mhinduro chaiyo ndiD.

3. Chitima chinofamba nekumhanya kwe72 km/h chakasvika panosvika njanji ichiyambuka mugwagwa uku chichiridza muridzo une frequency ye1600 Hz. Kana kumhanya kweruzha mumhepo kuri 340 ms-1, saka frequency yemuridzo inonzwikwa nemuridzi wechitima inoyambuka mugwagwa ndeye ….

A. 3600 Hz

B. 3400 Hz

C. 1800 Hz

D. 1700Hz

E. 1400Hz

Kukurukurirana

Zvinozivikanwa kuti:

Kumhanya kwekwakabva ruzha (v)_s) = 72 km/awa = 20 m/s (zvichienderana nechinhu chinofambisa ruzha)

Mafambiro eruzha (f) = 1600 Hz

Kumhanya kweruzha mumhepo (v) = 340 m/s

Kumhanya kwemuteereri (v)_p) = 0 (zero nekuti muteereri haasi kufamba)

Akabvunzwa: ruzha rwunonzwikwa kakawanda nemurindi (f')?

Mhinduro:

Mhinduro chaiyo ndiD.

4. Rori yemoto iri kufamba nekumhanya kwe20 ms^-1 uchiridza siren pafrequency ye400 Hz (speed yeruzha mumhepo 300 ms^-1). Kana injini yemoto iri kufamba kubva pamunhu akamira padivi pemugwagwa, munhu wacho achanzwa siren pa….

A. 375 Hz

B. 575 Hz

C. 600 Hz

D. 620 Hz

E. 725 Hz

Kukurukurirana

Zvinozivikanwa kuti:

v_s = 20 m/s (yakanaka nekuti mota iri kufamba kubva kune muteereri)

v_p = 0 (muteereri akanyarara ari parutivi pemugwagwa)

f = 400 hz

v = 300 m/s

Akabvunzwa: ruzha rwunonzwika kakawanda sei ?

Mhinduro:

Mhinduro chaiyo ndiA.

5. Chinorira kubva pashongwe yekunyevera chiri kurira nefrequency ye670 Hz. Mota iri kusvika pashongwe nekumhanya kwe90 km/h. Kana kumhanya kweruzha mumhepo kuri 335 m/s, saka frequency yeruzha rwechinorira runonzwiwa nemutyairi wemotokari ndeye...

A. 900 Hz

B. 840 Hz

C. 800 Hz

D. 750 Hz

E. 720 Hz

Kukurukurirana

Zvinozivikanwa kuti:

f = 670 hz

v_s = 0 (mufananidzo weshongwe)

v_p = 90 km/h = 25 m/s (zvakanaka nekuti muteereri ari kusvika kwakabva ruzha)

v = 335 m/s

Mubvunzo: Ruzha rwunonzwiwa nemutyairi (f') runoita kangani?

Mhinduro:

Mhinduro chaiyo ndiE.

6. Dini aive muchitima chakamira A. Chimwe chitima (B) chiri kufamba chichienda kuA nekumhanya kwe2 ms^-1 uchiridza muridzo une frequency ye676 Hz. Kana kumhanya kweruzha mumhepo kuri 340 ms^-1, ipapo kakawanda kacho muridzo wechitima B wakanzwikwa naDini waive….
A. 680 Hz

B. 676 Hz

C. 660 Hz

D. 656 Hz

E. 640 Hz

Kukurukurirana

Zvinozivikanwa kuti:

v_s = -2 m/s (chitima chisina kunaka B chiri kusvika kuDini nechitima A

v_p = 0 (Munguva pfupi yapfuura pachitima chakamira)

f = 676 hz

v = 340 m/s

Akabvunzwa: Dini akanzwa frequency yechitima B yakaita sei?

Mhinduro:

Mhinduro chaiyo ndiA.

7. Mutambi wenhabvu anomhanya nekumhanya kwev_p kuna referee uyo akanga akanyarara achiridza muridzo pa frequency ye f_sKana kumhanya kwemhepo panzvimbo iyoyo kuri v, saka frequency inonzwiwa nemutambi inogadzirwa se….

Kukurukurirana

Zvinozivikanwa :

v_s = 0 (mutongi akanyarara)

v_p =v_p (zvakanaka nekuti iri pedyo nekwakabva ruzha)

f = f_s

v = v

Akabvunzwa : chii chinonzi frequency formula inonzwiwa nevatambi venhabvu?

Jawab :

Mhinduro chaiyo ndiA.

8. Amburenzi A iri kufamba nekumhanya kwe 0,25 v kumashure kwe sedan B iyo iri kufamba nekumhanya kwe 0,2 v munzira imwecheteyo neA. Panguva iyoyo, amburenzi A inoridza siren yayo pa 1.000 Hz. Kana kumhanya kweruzha kuri v, frequency inonzwikwa nemutyairi we sedan B ndeye…

A. 1.500 Hz

B. 1.250 Hz

C. 1.111 Hz

D. 1.067 Hz

E. 1.000 Hz

Kukurukurirana

Zvinozivikanwa :

Mafambiro eruzha (f) = 1.000 Hz

Kumhanya kwekwakabva ruzha (v)_s) = -0,25 v (zvichienderana nechinhu chinoburitsa ruzha)

Kumhanya kweruzha (v) = v

Kumhanya kwemuteereri (v)_p) = -0,2 v (zvichienderana nechinhu chinoburitsa ruzha)

Akabvunzwa : Kuwanda kweruzha runonzwiwa nemuteereri (f')

Jawab :

Fomura yemhedzisiro yeDoppler:

Mhinduro chaiyo ndiD.

9. Soko reruzha rine frequency ye640 Hz rinofamba richienda kune mucherechedzi nekumhanya kwe20 m/s. Kana kumhanya kweruzha mumhepo kuri 340 m/s uye mucherechedzi achibva kure neruzha nekumhanya kwe10 m/s, saka frequency yeruzha rwunonzwiwa nemucherechedzi ndeye…

A. 600 Hz

B. 660 Hz

C. 900 Hz

D. 980 Hz

E. 1300 Hz

Kukurukurirana

Zvinozivikanwa :

Mafambiro eruzha (f) = 640 Hz

Kumhanya kwekwakabva ruzha (v)_s) = -20 m/s (zvichienderana nemhepo senzira inofambisa ruzha)

Kumhanya kweruzha (v) = 340 m/s (zvichienderana nemhepo senzira yekutumira ruzha)

Kumhanya kwemuteereri (v)_p) = -10 m/s (zvichienderana nemhepo senzira inofambisa ruzha)

Akabvunzwa : Kuwanda kweruzha runonzwiwa nemuteereri (f')

Jawab :

Mhinduro chaiyo ndeiyi B.

10. Soko reruzha rinofamba nekumhanya kwe60 m/s richisiya mucherechedzi ari kumashure kwaro achifamba nenzira imwecheteyo nesoko reruzha pakumhanya kwe10 m/s. Kana kumhanya kweruzha mumhepo kuri 340 m/s uye frequency yesoko reruzha iri 800 Hz, saka frequency yeruzha rwunonzwiwa nemucherechedzi ndeye…

A. 700 Hz

B. 800 Hz

C. 940 Hz

D. 960 Hz

E. 1.120 Hz

Kukurukurirana

Zvinozivikanwa :

Mafambiro eruzha (f) = 800 Hz

Kumhanya kwekwakabva ruzha (v)_s) = 60 m/s (zvichienderana nemhepo senzira inofambisa ruzha)

Kumhanya kweruzha (v) = 340 m/s (zvichienderana nemhepo senzira yekutumira ruzha)

Kumhanya kwemuteereri (v)_p) = 10 m/s (zvichienderana nemhepo senzira inofambisa ruzha)

Akabvunzwa : Kuwanda kweruzha runonzwiwa nemuteereri (f')

Jawab :

Mhinduro chaiyo ndiA.

Kusimba kweRuzha

11. Kusimba kweruzha panzvimbo P iri 3 m kubva panobva ruzha i10^-4 watts/m². Poindi R iri 300 m kubva panobva ruzha. Kana muganho wesimba I₀ = 10^-12 watts/m², saka kuenzanisa kwemazinga esimba pamapoinzi P naR ndiko…

A. 1: 2

B. 2: 1

C. 2 : 3

D. 2: 4

Chikamu 3: 4

Kukurukurirana

Zvinozivikanwa :

Kusimba kweruzha panzvimbo P (I)_P= = 10^-4 W / m²

Kureba kwenzvimbo P kubva panobva ruzha (r)_P) = 3 mamita

Kureba kwenzvimbo R kubva panobva ruzha (r)_R) = 300 mamita

Kusimba kwemuganho (I)_o= = 10^-12 Watt/m²

Akabvunzwa : Kuenzanisa kwemazinga esimba pamapoinzi P neR (TI)_P : IT_R)

Jawab :

Fomura yehukama huripo pakati pekusimba uye daro :

I_p r_p² = Ini_R r_R²

Kusimba kweruzha paR :

(10^-4)(3²) = (Ini_R)(300²)

(10^-4)(9) = (Ini_R)(90000)

9 X 10^-4 = (Ini_R)(9 x 10⁴)

I_R = 9 x gumi^-4 : 9 x 10^-4

I_R = 10^-8

Kusimba kweruzha panzvimbo R i10^-8 W / m².

Kuenzanisa kweTI pamapoinzi P naR :

80 dB: 40 dB

2: 1

Mhinduro chaiyo ndeiyi B.

12. Simba reruzha panzvimbo A iri mita imwe kubva panobva ruzha igumi^-7 W / m². Poindi B iri 100 metres kubva panobva ruzha. Kana simba remuganho riri 10^-12 W / m², kuenzanisa kwemazinga esimba muA neB ndiko…

A. 5: 3

B. 5: 1

C. 4 : 5

D. 4: 3

Chikamu 3: 1

Kukurukurirana

Zvinozivikanwa :

Kusimba kweruzha panzvimbo A (I)_A= = 10^-7 W / m²

Kureba kwenzvimbo A kubva panobva ruzha (r)_A) = 1 mamita

Kureba kwenzvimbo B kubva panobva ruzha (r)_R) = 100 mamita

Kusimba kwemuganho (I)_o= = 10^-12 Watt/m²

Akabvunzwa : Kuenzanisa kwemazinga esimba pamapoinzi A neB (TI)_A : IT_B)

Jawab :

Fomura yehukama huripo pakati pekusimba uye daro :

I_A r_A² = Ini_B r_B²

Kusimba kweruzha panzvimbo B :

(10^-7)(1²) = (Ini_B)(100²)

(10^-7)(1) = (Ini_B)(10.000)

1 X 10^-7 = (Ini_B)(1 x 10⁴)

I_B = 10^-7 : 10⁴

I_B = 10^-11

Kusimba kweruzha panzvimbo R i10^-11 W / m².

Kuenzanisa IT pamapoinzi A neB :

50 dB: 10 dB

5: 1

Mhinduro chaiyo ndeiyi B.

13. Mapoinzi A neB ane chinhambwe che800 m uye 400 m zvichiteerana kubva panobva ruzha. Kana uri munzvimbo A ukanzwa ruzha rune simba re10^-3 W / m², saka kuenzanisa kwemazinga esimba remapoinzi A naB ndiko… (log 2 = 0,3 naI_o = 10^-12 W / m²)

A. 11: 15

B. 15: 11

C. 15 : 16

D. 16: 11

Chikamu 16: 15

Kukurukurirana

Zvinozivikanwa :

Kusimba kweruzha panzvimbo A (I)_A= = 10^-3 W / m²

Kureba kwenzvimbo A kubva panobva ruzha (r)_A) = 800 mamita

Kureba kwenzvimbo B kubva panobva ruzha (r)_B) = 400 mamita

Kusimba kwemuganho (I)_o= = 10^-12 Watt/m²

Rogi 2 = 0,3

Akabvunzwa : Kuenzanisa kwemazinga esimba pamapoinzi A neB (TI)_A : IT_B)

Jawab :

Fomura yehukama huripo pakati pekusimba uye daro :

I_A r_A² = Ini_B r_B²

Kusimba kweruzha panzvimbo B :

(10^-3)(800²) = (Ini_B)(400²)

(10^-3)(640.000) = (Ini_B)(160.000)

(10^-3)(64) = (Ini_B)(16)

(10^-3)(4) = (Ini_B)(1)

I_B = 4 x gumi^-3 : 1

I_B = 4 x gumi^-3

Kusimba kweruzha panzvimbo B i4 x 10^-3 W / m².

Chiyero cheTI pamapoinzi P naR ndeichi:

90 dB: 96 dB

15: 16

Mhinduro chaiyo ndiC.

Kusimba uye kusimba kweruzha

14. Tafura yemazinga esimba renzwi rega rega.

Kwakabva ruzha	Kusimba Kwenzwi (TI)
Ruzha rweshiri dzichirira	80 dB
Siren yeamburenzi	100 dB
Kutinhira (mheni)	160 dB

Injini yemotokari inogadzira TI ine simba rekurira = 70 dB (I)._o = 10^-12 Watt m^-2Kuti ruzha rweinjini rubudise huwandu hwesimba rakaenzana neruzha rwesiren yeamburenzi, huwandu hweinjini dzemotokari hunodiwa ndehwekuti….

Muchina weA. 20.00
Muchina weB. 30.00
Michina yeC. 100.0
D. Michina chiuru
Michina zviuru zvitatu (E. 3.000)

Kukurukurirana
Zvinozivikanwa :
Mota TI = 70 dB
TI yeAmburenzi = 100 dB
I_o = 10^-12 Watt/m²
Akabvunzwa : IT yemotokari inofanira kuenzana neinjini ngani dzemotokari neIT yeamburenzi?
Jawab :

Ambulance TI = mota TI + 10 log x
100 = 70 + 10 log x
100 – 70 = 10 log x
30 = 10 log x
30 / 10 = log x
3 = log x
Antilog 3 = x
10³ = x
1000 = x
Mhinduro chaiyo ndiD.

15. Ruzha rwunobva kune ruzha rune simba re60 dB (I_o = 10 ^{- 12} watt m^-2). Kana manzwi zana akafanana achinzwika panguva imwe chete, huwandu hwesimba reruzha hunoburitswa hunova….

A. 62 dB
B. 80 dB
C. 82 dB
D. 100 dB
E. 160 dB

Kukurukurirana
Zvinozivikanwa :
TI = 60 dB
I_o = 10^-12 W / m²
x = 100
Akabvunzwa : Ko TI 100 inobva kupi?
Jawab :
Manyuko eruzha eTI 100 = TI muchina 1 + 10 log x
TI = 60 + 10 log 100
TI = 60 + 10 log 10²
TI = 60 + (2)(10)(log 10)
TI = 60 + 20
TI = 80 dB
Mhinduro chaiyo ndeiyi B.

Mhedzisiro yeDoppler
16. Mutambi wenhabvu anomhanya nekumhanya v_p kuna referee uyo akanga akanyarara achiridza muridzo pa frequency ye f_sKana kumhanya kwemhepo panzvimbo iyoyo kuri v, saka frequency inonzwiwa nemutambi inogadzirwa se….

Kukurukurirana
Zvinozivikanwa :
v_s = 0 (mutongi akanyarara)
v_p =v_p (zvakanaka nekuti iri pedyo nekwakabva ruzha)
f = f_s
v = v
Akabvunzwa : chii chinonzi frequency formula inonzwiwa nevatambi venhabvu?
Jawab :

Mhinduro chaiyo ndiA.

Kwakabva mubvunzo:

Mibvunzo yeNational Examination Physics yeChikoro Chesekondari/Chikoro Chepamusoro Chebasa