4 mau laʻana o nā nīnau no ka ikaika o ke kani
1. ʻO nā kiko A a me B he 4 m a me 9 m mai kahi kumu kani, kēlā me kēia. Inā ʻo I A a me I B nā ikaika kani ma nā kiko A a me B, kēlā me kēia , a laila ʻo I A : ʻo I B …
A. 3 : 2
B. 4 : 9
K. 9 : 4
D. 16 : 81
E. 81 : 16
Pahana
Ua ʻike ʻia:
Ka mamao o ke kiko A mai ke kumu kani (r A ) = 4 mika
Ka mamao o ke kiko B mai ke kumu kani (r B ) = 9 mika
Ka ikaika o ke kani ma ke kiko A = I A
Ka ikaika o ke kani ma ke kiko B = I B
Nīnau ʻia: I A : I B
Pane:
ʻO ke ʻano hana no ka pilina ma waena o ka ikaika a me ka mamao:
ʻO ka pane pololei ʻo E.
2. ʻO ka ikaika o ke kani o ka mīkini humuhumu i ka wā e hana ana he 10-9 Wm-2No ka ikaika paepae kani o 10-12 Wm-2, a laila ʻo ka pae ikaika o ke kani o nā mīkini humuhumu like he 10 e hana ana he…..
A. 400 dB
B. 300 dB
C. 40 dB
D. 30 dB
E. 20 dB
Pahana
Ua ʻike ʻia:
ʻO I = 10 -9 W/ m2
ʻO I = 10 -12 W/ m2
x = 10
Nīnau ʻia: Mīkini humuhumu TI 10?
Pane:
Nā mīkini TI 10 = mīkini TI 1 + 10 log x
TI = 30 + 10 log 10
TI = 30 + 10 log 10 1
TI = 30 + (1)(10)(log 10)
TI = 30 + 10
TI = 40 dB
ʻO C ka pane pololei.
3. ʻO ka ikaika o ke kani ʻana o kekahi pi he 10 dB. Inā ua manaʻo ʻia ua like ke kani ʻana o kēlā me kēia pi a ʻo ka paepae lohe kanaka he 10 −12 Wm −2 , a laila ʻo ka ikaika o ke kani ʻana o 1000 pi he…
A. 10 −8 Wm −2
B. 10 −7 Wm −2
C. 10 −6 Wm −2
D. 10 −5 Wm −2
E. 10 −4 Wm −2
Pahana
Ua ʻike ʻia:
TI = 10 dB
ʻO I = 10 -12 W/ m2
x = 1000
Nīnau ʻia: Nā pi TI 1000?
Pane:
4. ʻO ke kani ʻana o ka pū o ka mokokaikala ke kani ʻia, he pae ikaika o 40 dB ia, ʻoiai ʻo ke kani ʻana o ka pū o ke kaʻa ke kani ʻia, he pae ikaika o 60 dB ia (I o = 10 -12 W m -2 ). Inā kani ʻia he 100 mau pū o ka mokokaikala a me 10 mau pū o ke kaʻa i ka manawa like, a laila ʻo ka lakio o nā pae ikaika o nā mokokaikala i nā kaʻa he ....
A. 5 : 6
B. 6 : 7
K. 7 : 8
D. 8 : 9
E. 9 : 10
Pahana
Ua ʻike ʻia:
Ka pae ikaika (TI) o ke kani o ka pū kaʻa mokokaikala = 40 dB
ʻO ka pae ikaika (TI) o ke kani pepeiaohao kaʻa = 60 dB
ʻO ka awelika o ka ikaika haʻahaʻa loa e hiki ai i nā kānaka ke lohe (I o ) = 10 -12 W m -2
Nīnau: He aha ka lakio TI o 100 mau mokokaikala i ka TI o 10 mau kaʻa?
Pane:
ʻO ka hoʻohālikelike ʻana o nā mokokaikala TI 100 me nā kaʻa TI 10 penei:
60: 70
6: 7
ʻO ka pane pololei ʻo B.
Puna nīnau:
Nā Nīnau Hoʻokolohua Lahui no ke Kino no ke Kula Kiʻekiʻe/Kula Kiʻekiʻe ʻOihana
