Lub zog ntawm lub suab - teeb meem thiab kev daws teeb meem
1. Cov ntsiab lus A thiab B nyob ntawm 4 meters thiab 9 meters ntawm qhov chaw ntawm lub suab. Yog tias I A thiab I B yog qhov muaj zog ntawm qhov chaw A thiab qhov chaw B, ces I A : I B =…
Paub:
Qhov deb ntawm qhov chaw A ntawm qhov chaw suab (r A ) = 4 meters
Qhov deb ntawm qhov chaw B ntawm qhov chaw suab (rB ) = 9 meters
Lub zog ntawm lub suab ntawm qhov chaw A = I A
Lub zog ntawm lub suab ntawm qhov chaw B = I B
Xav tau: Kuv A : Kuv B
Tshuaj:
Kuv Ar A 2 = Kuv Ar B 2
Kuv A 4 2 = Kuv B 9 2
Kuv A 16 = Kuv B 81
IB / IB = 81/16
2. Lub zog ntawm ib qho chaw suab yog 10 −9 Wm −2 . Io = 10 −12 Wm −2 . Lub suab ntawm 10 qhov chaw suab yog dab tsi?
Tshuaj:
Paub:
Kuv = 10 -9 W/ m2
Io = 10 -12 W / m2
x = 10 os
Paub: Qib suab (β)
Tshuaj:
3. Lub suab nrov ntawm ib qho chaw suab yog 10 dB. Lub zog ntawm 1000 qhov chaw suab yog dab tsi? Lub zog tsawg kawg nkaus Io = 10 −12 Wm −2.
Paub:
β = 10 dB
Io = 10 -12 W / m2
x = 1000 os
Xav tau : Qhov muaj zog
Tshuaj:
Lub zog ntawm qhov chaw ntawm lub suab:
Lub zog ntawm 1000 qhov chaw ntawm lub suab:
Kuv = (1000)(10 -11 ) = (10 3 )(10 -11 )
Kuv = 10 -8 W/ m2
4. Lub suab nrov ntawm A yog 40 dB, thiab lub suab nrov ntawm B yog 60 dB. Io = 10 -12 W m -2 . Txheeb xyuas 100β A : 10β B.
Paub:
Lub suab nrov ntawm A = 40 dB
Lub suab nrov ntawm B = 60 dB
Io = 10 -12 W m -2.
Xav tau : 100β A : 10β B
Tshuaj:
Lub suab nrov ntawm 100 A:
β = 40 + 10 log 100
β = 40 + 10 log 10 2
β = 40 + (2)(10)(cav 10)
β = 40 + (2)(10)(1)
β = 40 + 20
β = 60 dB
Lub suab nrov ntawm 10 B:
β = 60 + 10 log 10
β = 60 + 10 log 10 1
β = 60 + (1)(10)(cav 10)
β = 60 + (1)(10)(1)
β = 60 + 10
β = 70 dB
β A : β B
60: 70
6: 7
5. Yog tias qhov chaw P yog qhov chaw ntawm lub suab, ces qhov piv ntawm lub suab nrov ntawm cov chaw S, R, thiab Q yog ...
Paub:
Qhov deb ntawm qhov chaw Q ntawm qhov chaw suab (r)Q) = 3 meters
Qhov deb ntawm qhov chaw R ntawm qhov chaw suab (r R ) = 6 meters
Qhov deb ntawm qhov chaw S ntawm qhov chaw suab (r S ) = 5 meters
Lub suab nrov ntawm qhov point Q = I Q
Lub suab nrov ntawm qhov taw tes R = I R
Lub suab nrov ntawm qhov taw tes S = I S
Xav tau: Kev sib piv ntawm lub suab nrov ntawm cov ntsiab lus S, R, thiab Q (I S : I R : I Q )
Tshuaj:
Lub suab nrov ntawm qhov S:
Lub suab nrov ntawm qhov taw tes R:
Lub suab nrov ntawm qhov Q :
Kev sib piv ntawm lub suab nrov ntawm cov ntsiab lus S, R, thiab Q:
6. Lub ntsiab lus A yog P ntawm qhov chaw suab, lub ntsiab lus B yog 2P ntawm qhov chaw suab thiab lub ntsiab lus C yog 4P ntawm qhov chaw suab. Kev sib piv ntawm lub zog suab ntawm A , B, thiab C yog ...
Paub:
Qhov deb ntawm qhov chaw A ntawm lub suab (r A ) = P
Qhov deb ntawm qhov chaw B ntawm lub suab (r B ) = 2P
Qhov deb ntawm qhov chaw C ntawm qhov chaw suab (r C ) = 4P
Lub suab nrov ntawm qhov chaw A = I A
Lub suab nrov ntawm qhov chaw B = I B
Lub suab nrov ntawm qhov C = I C
Xav tau: Kev sib piv ntawm lub zog suab ntawm A, B, thiab C (I A : I B : I C )
Tshuaj:
Lub suab nrov ntawm qhov chaw A:
Lub suab nrov ntawm qhov chaw B:
Lub suab nrov ntawm qhov taw tes t C:
Kev sib piv ntawm lub zog suab ntawm A, B, thiab C:
7. Tag nrho muaj 100 tus neeg hu nkauj. Yog tias qib suab nrov ntawm ib tus tub ntxhais kawm thaum hu nkauj yog 40 dB (xav tias rau txhua tus menyuam yog tib yam), ces qhov nrov ntawm lub suab tshwm sim yog ... (I o = 10 -12 Wm -2 )
Paub:
Qib ntawm qhov muaj zog ntawm ib tus tub ntxhais kawm (TI) = 40 dB
Io = 10 -12 W / m2
Tus naj npawb ntawm cov tub ntxhais kawm (x) = 100
Xav tau: Lub suab nrov ntawm 100 tus tub ntxhais kawm
Tshuaj:
Lub suab nrov ntawm tus tub ntxhais kawm:
Lub suab nrov ntawm 100 tus tub ntxhais kawm:
Kuv x = (x)(Kuv)
Kuv x = (100)(10 -8 ) = (10 2 )(10 -8 )
Kuv x = 10 -6 W/ m2
8. Lub zog suab ntawm 100 lub tshuab zoo sib xws yog 10 -7 Watt.m -2 . Yog tias Io = 10 -12 Watt.m -2 , ces qib ntawm lub zog suab ntawm lub tshuab yog ...
Paub:
Lub zog suab ntawm 100 lub tshuab (I x ) = 10 -7 Watt.m -2
Io = 10 -12 W / m2
Tus naj npawb ntawm cov tshuab (x) = 100 = 10 2
W xav tau: Lub suab nrov ntawm lub tshuab (TI)
Tshuaj:
Lub zog suab ntawm lub tshuab:
Kuv x = (x)(Kuv)
10 -7 = (10 2 )(Kuv)
Kuv = 10 -7 / 10 2 = (10 -7 )(10 -2 ) = 10 -9
Qib ntawm lub suab nrov ntawm lub tshuab (TI):
9. Lub zog suab ntawm qhov chaw suab yog 6 x 10 -6 W/cm2 . Yog tias qib zog suab nce ntxiv 10 db, txiav txim siab qhov zog ntawm lub suab.
Paub:
Qhov muaj zog (I) = 6 x 10 -6 W/ cm2
Luas = 10 - 12 W / m 2 = 10 - 12 W / 10 4 cm 2 = 10 - 16 W / cm 2
Xav tau: Lub zog ntawm lub suab
Tshuaj:
Qhov ntxiv ntawm lub suab nrov ntawm 10 W/m2 = 10 -3 W/cm2 yog sib npaug rau qhov ntxiv ntawm lub suab nrov ntawm 10 dB. Qhov ntxiv ntawm lub suab nrov ntawm 10 2 W/m2 = 10 -2 W/cm2 yog sib npaug rau qhov ntxiv ntawm lub suab nrov ntawm 20 dB. Thiab lwm yam.
Yog tias qib zog nce ntxiv 10 dB, qhov zog nce ntxiv 10 -3 W/cm2 . Yog li qhov zog dhau los ua 6 x 10 -6 W/cm2 ) + ( 10 -4 W/cm2 ) = (6 x 10 -6 W/cm2 ) + (100 x 10 -6 W/cm2 ) = 106 x 10 -6 W/ cm2.
10. Tus Neeg Saib Xyuas A nyob deb 5 m ntawm qhov chaw suab. Thaum tus neeg saib xyuas B nyob deb 10 m ntawm tib qhov chaw suab. Yog li ntawd, qhov sib piv ntawm lub suab nrov uas cov neeg saib xyuas B thiab A hnov yog…
Paub:
Qhov deb ntawm A ntawm qhov chaw suab (r A ) = 5 meters
Qhov deb ntawm B ntawm qhov chaw suab (rB ) = 10 meters
Xav tau: Qhov piv ntawm lub suab nrov uas cov neeg saib xyuas B thiab A hnov
Tshuaj:
IB : IA = 1 : 4
Cov lus teb yog B.
- Lub suab nrov yog dab tsi thiab nws txawv ntawm qhov nrov li cas?
- tebLub zog suab yog qhov ntsuas ntawm lub zog suab ib chav tsev, feem ntau ntsuas hauv watts ib square meter (W/m2)2). Qhov nrov, ntawm qhov tod tes, yog kev pom ntawm lub zog ntawm lub suab, feem ntau ntsuas hauv decibels (dB). Txawm hais tias qhov muaj zog yog qhov ntsuas lub cev, qhov nrov yog qhov kev paub ntawm tus kheej uas tuaj yeem sib txawv ntawm cov tib neeg.
- Txoj cai lij choj inverse square cuam tshuam li cas rau lub suab nrov?
- tebTxoj cai lij choj inverse square hais tias lub zog ntawm lub suab txo qis nrog rau lub square ntawm qhov deb ntawm qhov chaw. Qhov no txhais tau tias thaum koj txav mus deb ntawm qhov chaw, lub zog poob qis sai sai.
- Vim li cas ob lub suab uas muaj tib lub zog tsis tas yuav muaj tib lub suab nrov?
- tebLub pob ntseg tib neeg muaj kev rhiab heev rau cov zaus sib txawv. Yog li ntawd, txawm tias ob lub suab muaj tib lub zog tab sis cov zaus sib txawv, lawv yuav raug pom tias muaj cov qib nrov sib txawv.
- Lub zog ntawm lub suab cuam tshuam li cas rau lub amplitude ntawm lub suab nthwv dej?
- tebLub zog ntawm lub suab yog sib npaug ncaj qha rau lub xwmfab ntawm qhov loj ntawm lub suab nthwv dej. Yog tias qhov loj ntawm lub suab nthwv dej raug ob npaug, qhov hnyav yuav nce ntxiv plaub npaug.
- Vim li cas ib lub suab ntxhi hauv chav ntsiag to thiaj li hnov tau meej, tab sis tib lub suab ntxhi ntawm ib sab ntawm dej tsaws tsag uas nrov nrov tsis hnov tau?
- tebQhov no yog vim muaj qhov sib txawv ntawm cov suab nrov tom qab. Hauv chav tsev ntsiag to, lub suab nrov tom qab qis, ua rau lub suab ntxhi sawv tawm. Nyob ib sab ntawm dej tsaws tsag, lub suab nrov heev npog lub suab ntxhi ntsiag to, ua rau nws tsis hnov.
- Qhov pib ntawm kev hnov lus thiab qhov pib ntawm kev mob yog dab tsi hais txog qhov muaj zog ntawm lub suab?
- tebLub suab nrov tshaj plaws uas tib neeg pob ntseg hnov tau yog lub suab ntsiag to tshaj plaws, feem ntau yog li ntawm qhov muaj zog li ntawm Qhov ntsuas qhov mob, uas sawv cev rau qib suab uas tuaj yeem ua rau mob thiab ua rau pob ntseg puas tsuaj, yog nyob ib puag ncig .
- Vim li cas cov suab zoo li ntsiag to dua thaum hnov los ntawm phab ntsa lossis lwm yam kev thaiv?
- tebThaum cov nthwv suab ntsib ib qho kev thaiv, qee lub zog raug cuam tshuam, nqus, thiab xa mus. Qhov kev nqus thiab kev cuam tshuam txo qhov muaj zog ntawm lub suab uas kis los ntawm qhov kev thaiv, ua rau nws suab ntsiag to dua.
- Qhov zaus cuam tshuam li cas rau qhov muaj zog ntawm lub suab uas cov khoom siv nqus tau?
- tebCov ntaub ntawv sib txawv muaj cov coefficients nqus sib txawv rau cov zaus sib txawv. Piv txwv li, cov zaus qis (suab bass) nyuaj rau nqus thiab tuaj yeem nkag mus rau hauv phab ntsa yooj yim dua li cov zaus siab dua.
- Vim li cas cov chaw ua yeeb yam thiab cov chaw ua yeeb yam thiaj li nqis peev rau kev tiv thaiv suab thiab kev kho acoustic?
- tebKev tiv thaiv suab nrov pab tiv thaiv kom tsis txhob muaj suab nrov sab nraud thiab tiv thaiv kom suab tsis txhob tawm mus sab nraud, kom ntseeg tau tias tsuas yog hnov lub suab xav tau hauv qhov chaw. Kev kho suab pab tswj kev cuam tshuam suab hauv qhov chaw kom ntseeg tau tias muaj kev faib suab meej thiab sib npaug.
- Lub suab nrov npaum li cas cuam tshuam rau kev puas tsuaj rau pob ntseg?
- tebKev raug suab nrov heev ntev ntev tuaj yeem ua rau puas lossis poob pob ntseg. Qhov hnyav thiab lub sijhawm ntawm kev raug suab nrov heev ob qho tib si ua lub luag haujlwm; txawm tias kev raug suab nrov heev luv luv tuaj yeem ua rau puas tsuaj mus tas li, thaum kev raug suab nrov nruab nrab ntev kuj tuaj yeem ua rau muaj kev phom sij.
