Te kaha o te oro - ngā raruraru me ngā otinga
1. Kei te 4 mita me te 9 mita te tawhiti o ngā pūwāhi A me B mai i te pūtake o te oro. Mena ko te kaha o te I A me te I B kei te pūwāhi A me te pūwāhi B, ko te I A : I B =…
Mōhiotia:
Ko te tawhiti o te pūwāhi A mai i te pūtake oro (r A ) = 4 mita
Ko te tawhiti o te pūwāhi B mai i te pūtake o te oro (r B ) = 9 mita
Ko te kaha o te oro i te pūwāhi A = I A
Ko te kaha o te oro i te pūwāhi B = I B
E hiahiatia ana: I A : I B
Rongoā:
I A r A 2 = I B r B 2
I A 4 2 = I B 9 2
IA 16 = IB 81
IA / IB = 81/16
2. Ko te kaha o tētahi pūtake oro ko 10 −9 Wm −2 . I o = 10 −12 Wm −2 . He aha te taumata oro o ngā pūtake oro e 10?
Rongoā:
Mōhiotia:
I = 10 -9 W/ m2
I o = 10 -12 W/ m2
x = 10
Mōhiotia: Taumata oro (β)
Rongoā:
3. Ko te taumata oro o tētahi pūtake oro he 10 dB. He aha te kaha o ngā pūtake oro e 1000? Ko te kaha iti rawa I o = 10 −12 Wm −2.
Mōhiotia:
β = 10 dB
I o = 10 -12 W/ m2
x = 1000
E hiahiatia ana : Te kaha
Rongoā:
Te kaha o te pūtake oro:
Te kaha o ngā pūtake oro 1000:
I = (1000)(10 -11 ) = (10 3 )(10 -11 )
I = 10 -8 W/ m2
4. Ko te taumata oro o A he 40 dB, ā, ko te taumata oro o B he 60 dB. I o = 10 -12 W m -2 . Whakatauhia te 100β A : 10β B.
Mōhiotia:
Te taumata oro o A = 40 dB
Ko te taumata oro o B = 60 dB
I o = 10 -12 W m -2.
E hiahiatia ana : 100β A : 10β B
Rongoā:
Te taumata oro o te 100 A:
β = 40 + 10 log 100
β = 40 + 10 log 10 2
β = 40 + (2)(10)(rōka 10)
β = 40 + (2)(10)(1)
β = 40 + 20
β = 60 dB
Te taumata oro o te 10 B:
β = 60 + 10 log 10
β = 60 + 10 log 10 1
β = 60 + (1)(10)(rōka 10)
β = 60 + (1)(10)(1)
β = 60 + 10
β = 70 dB
β A : β B
60: 70
6: 7
5. Mena ko te pūwāhi P te pūtake o te oro, ko te ōwehenga o te kaha o te oro i ngā pūwāhi S, R, me Q ko …
Mōhiotia:
Ko te tawhiti o te pūwāhi Q mai i te pūtake oro (rQ) = 3 mita
Ko te tawhiti o te pūwāhi R mai i te pūtake oro (r R ) = 6 mita
Ko te tawhiti o te pūwāhi S mai i te pūtake oro (r S ) = 5 mita
Te kaha o te oro i te pūwāhi Q = I Q
Te kaha o te oro i te pūwāhi R = I R
Te kaha o te oro i te pūwāhi S = I S
E hiahiatia ana: Te whakataurite i te kaha o te oro i ngā pūwāhi S, R, me Q (I S : I R : I Q )
Rongoā:
Te kaha o te oro i te pūwāhi S:
Te kaha o te oro i te pūwāhi R:
Te kaha o te oro i te pūwāhi Q :
Te whakataurite i te kaha o te oro i ngā pūwāhi S, R, me Q:
6. Ko te pūwāhi A he P mai i te pūtake oro, ko te pūwāhi B he 2P mai i te pūtake oro, ā, ko te pūwāhi C he 4P mai i te pūtake oro. Ko te whakatairite i te kaha o te oro i A , B, me C he …
Mōhiotia:
Te tawhiti o te pūwāhi A mai i te pūtake oro (r A ) = P
Te tawhiti o te pūwāhi B mai i te pūtake oro (r B ) = 2P
Te tawhiti o te pūwāhi C mai i te pūtake oro (r C ) = 4P
Te kaha o te oro i te pūwāhi A = I A
Te kaha o te oro i te pūwāhi B = I B
Te kaha o te oro i te pūwāhi C = I C
E hiahiatia ana: Te whakataurite i te kaha o te oro i A, B, me C (I A : I B : I C )
Rongoā:
Te kaha oro i te pūwāhi A:
Te kaha oro i te pūwāhi B:
Te kaha o te oro i te pūwāhi t C:
Te whakataurite i te kaha o te oro i A, B, me C:
7. Kotahi rau te katoa o ngā tāngata e waiata ana. Mēnā ko te taumata o te kaha o te oro o tētahi ākonga i te wā e waiata ana he 40 dB (mēnā he ōrite mō ia tamaiti), ko te kaha o te oro ka puta ko … (I o = 10 -12 Wm -2 )
Mōhiotia:
Te taumata o te kaha o te tauira kotahi (TI) = 40 dB
I o = 10 -12 W/ m2
Te maha o ngā ākonga (x) = 100
E hiahiatia ana: Te kaha o te oro o te 100 ākonga
Rongoā:
Te kaha o te oro o te ākonga:
Te kaha o te oro o te 100 ākonga:
I x = (x)(I)
I x = (100)(10 -8 ) = (10 2 )(10 -8 )
I x = 10 -6 W/ m2
8. Ko te kaha o te tangi o ngā mīhini ōrite 100 ko 10 -7 Watt.m -2 . Mena ko I o = 10 -12 Watt.m -2 , ko te taumata o te kaha o te tangi o tētahi mīhini ko…
Mōhiotia:
Te kaha oro o ngā mīhini 100 (I x ) = 10 -7 Watt.m -2
I o = 10 -12 W/ m2
Te maha o ngā mīhini (x) = 100 = 10 2
E hiahiatia ana: Te taumata kaha o te tangi o te mīhini (TI)
Rongoā:
Te kaha o te tangi o te mīhini:
I x = (x)(I)
10 -7 = (10 2 )(I)
I = 10 -7 / 10 2 = (10 -7 )(10 -2 ) = 10 -9
Te taumata o te kaha oro o te mīhini (TI):
9. Ko te kaha o te oro o tētahi pūtake oro he 6 x 10 -6 W/cm 2. Mēnā ka whakanuia te kaha o te oro mā te 10 db, tātaihia te kaha o te oro.
Mōhiotia:
Kaha (I) = 6 x 10 -6 W/cm 2
I o = 10 -12 W/m 2 = 10 -12 W / 10 4 cm 2 = 10 -16 W/cm 2
E hiahiatia ana: Te kaha o te oro
Rongoā:
Ko te tāpiri i te kaha oro o te 10 W/m2 = 10 -3 W/cm2 he ōrite ki te tāpiri i te taumata kaha oro o te 10 dB. Ko te tāpiri i te kaha oro o te 10 W /m2 = 10 -2 W/cm2 he ōrite ki te tāpiri i te taumata kaha oro o te 20 dB. Ā, pērā tonu.
Ki te whakanuia te taumata kaha mā te 10 dB, ka piki ake te kaha mā te 10 -3 W/cm² . Nō reira, ko te kaha ka 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. E 5 m te tawhiti o te Kaimātaki A i tētahi pūtake oro. Ko te kaimātaki B ia e 10 m te tawhiti mai i te pūtake oro kotahi. Nō reira, ko te ōwehenga o te kaha o te oro i rangona e ngā kaimātaki B me A ko…
Mōhiotia:
Ko te tawhiti o A mai i te pūtake o te oro (r A ) = 5 mita
Ko te tawhiti o B mai i te pūtake o te oro (r B ) = 10 mita
E hiahiatia ana: Te ōwehenga o te kaha oro i rangona e ngā kaimātakitaki B me A
Rongoā:
IB : IA = 1 : 4
Ko te whakautu tika ko B.
- He aha te kaha o te oro, ā, he aha tōna rerekētanga mai i te haruru nui?
- WhakautuKo te kaha o te oro he ine i te kaha o te oro mō ia wae horahanga, e inehia ana i roto i ngā watts mō ia mita tapawha (W/m2). Ko te kaha o te oro, i tētahi atu taha, he tirohanga whaiaro ki te kaha o te oro, e inehia ana i roto i ngā desipera (dB). Ahakoa he ine ā-tinana, ā-whaiaro te kaha, he wheako whaiaro te kaha e rerekē ana i waenga i te tangata.
- He aha te pānga o te ture tapawhā whakamuri ki te kaha o te oro?
- WhakautuE ai ki te ture tapawhā whakamuri, ka heke te kaha o te oro me te tapawhā o te tawhiti mai i te pūtake. Ko te tikanga tēnei, i a koe e neke atu ana i te pūtake, ka tere te heke o te kaha.
- He aha i kore ai e ōrite te nui o te oro e rua he rite te kaha?
- WhakautuHe rerekē te aro o te taringa tangata ki ngā auau rerekē. Nō reira, ahakoa he rite te kaha o ngā oro e rua engari he rerekē ngā auau, tera pea ka kitea he rerekē te nui o te oro.
- He aha te hononga o te kaha o te oro ki te whānui o te ngaru oro?
- WhakautuHe rite tonu te kaha o te oro ki te tapawhā o te kaha o te ngaru oro. Mēnā ka takiruatia te kaha o te ngaru oro, ka piki ake te kaha mā te whā tau.
- He aha e mārama ai te rangona o te haruru i roto i te rūma mārie, engari kāore e rangona te haruru i te taha o te wairere e haruru ana?
- WhakautuNā te rerekētanga o ngā taumata haruru papamuri tēnei. I roto i tētahi rūma marino, he iti te taumata haruru papamuri, e āhei ai te tū mai o te hāmama. I te taha o tētahi rerenga wai, ka hunaia te hāmama marino e te haruru kaha, e kore ai e rangona.
- He aha te paepae o te whakarongo me te paepae o te mamae e pā ana ki te kaha o te oro?
- WhakautuKo te paepae whakarongo te oro tino mārie ka taea e te taringa tangata te whakarongo, i te nuinga o te wā he kaha tata ki te Ko te paepae mamae, e tohu ana i ngā taumata oro ka pā te mamae me te kino pea ki te taringa, kei te taha .
- He aha i āhua mārie ake ai ngā oro ina rangona mā roto i te pakitara, i tētahi atu ārai rānei?
- WhakautuIna tūtaki ngā ngaru oro ki tētahi ārai, ka whakaatahia, ka mimitihia, ka tukuna atu hoki ētahi o te pūngao. Ka whakaitihia e te mimiti me te whakaata te kaha o te oro e tukuna ana mā te ārai, ka māeneene ake te tangi.
- He pēhea te pānga o te auau ki te kaha o te oro e mimitihia ana e ngā rauemi?
- WhakautuHe rerekē ngā tauwehenga mimiti o ngā rauemi rerekē mō ngā auau rerekē. Hei tauira, he uaua ake te mimiti i ngā auau iti (ngā oro pāorooro) ā, ka taea te uru ngāwari atu mā roto i ngā pakitara i ngā auau teitei ake.
- He aha ngā wāhi kōnohete me ngā whare tapere e haumi ai ki ngā ārai oro me ngā maimoatanga oro?
- WhakautuMā te ārai oro ka ārai i te turuturu o te haruru o waho, kia kore ai e rangona te oro e hiahiatia ana i roto i te wāhi. Mā ngā rongoā oro ka āwhina i te whakahaere i ngā whakaata oro i roto i te wāhi kia mārama, kia ōrite hoki te tohatoha oro.
- He aha te hononga o te kaha o te oro ki te kino pea o te rongonga?
- WhakautuMā te roa o te pānga ki ngā oro kaha ka raru pea te whakarongo, ka ngaro rānei. He pānga nui tō te kaha me te roa o te pānga; ahakoa he poto noa te pānga ki ngā oro tino nui ka raru pea, engari he kino anō hoki te pānga roa ki ngā oro āhua nui.
