Haʻilula Nalu Transverse Nalu Longitudinal Nalu Paʻa

Nā laʻana o nā nīnau a me nā haʻilula no nā nalu transverse, nā nalu longitudinal, nā nalu paʻa

Nā nalu transverse

1. ʻO ka mamao ma waena o ʻelua mau ʻauwai e pili ana o kahi nalu ʻilikai wai he 20 m. Lana kahi mea ma luna o ka ʻilikai wai a ʻike i ka neʻe haʻalulu. Inā he 4 kekona ka manawa no hoʻokahi haʻalulu, a laila ʻo ka wikiwiki o ka nalu…. m/s

1. 20
2. 15
3. 10
4. 5

Pahana
Ua ʻike ʻia:
Ka lōʻihi o ka nalu (λ) = 20 mika
Ka wā (T) = 4 kekona
Ua nīnau ʻia: Ka wikiwiki o ka nalu (v)
Pane:
Haʻilula wikiwiki o ka nalu:
v = λ / T = 20 mika / 4 kekona = 5 mika / kekona
ʻO D ka pane pololei.

2. Aia ʻelua mau kiko A a me B ma ke kaula a he 90 kenimika ke kaʻawale kekahi i kekahi. Hoʻolaha kahi nalu transverse ma ke kaula , no laila aia ke kiko A ma ka piko o ka nalu, aia ke kiko B ma lalo o ka nalu, a ma waena o lāua he ʻelua mau piko a me ʻelua mau lalo o ka nalu. Inā he 0,3 kekona ka manawa nalu, a laila ʻo ka wikiwiki o ka hoʻolaha ʻana o ka nalu ….

1. 10,8 knm / s
2. 18,0 knm / s
3. 120,0 knm / s
4. 200,0 knm / s

Pahana
Ua ʻike ʻia:
Ka mamao AB (l) = 90 kenimika
Ka wā nalu (T) = 0,3 kekona
Alapine (f) = 1/0,3 kekona
Aia ke kiko A ma ka piko o ka nalu, aia ke kiko B ma lalo o ka nalu
Ma waena o nā kiko A a me B aia ʻelua mau piko a me ʻelua mau lalo o ka nalu
Ua nīnau ʻia: Ka wikiwiki o ka laha ʻana o ka nalu (v = f λ)
Pane:
Ma muli o ke kiʻi, ua hoʻoholo ʻia he 2,5 mau nalu. ʻO ka mamao o hoʻokahi nalu (λ) = 90 kenimika / 2,5 = 36 kenimika

Ka wikiwiki o ka laha ʻana o ka nalu:
v = f λ = (1/0,3)(36) = 36/0,3 = 120 knm/s.
ʻO C ka pane pololei.

3. Hōʻike ka pakuhi ma lalo nei i ka neʻe ʻana o kahi kiko i loko o kahi waena ma ke ʻano he hana o ka manawa i ka wā e hele ai kahi nalu ma waena o ka waena.
Inā he 6 mika ka lōʻihi o ka nalu, a laila ʻo ka wikiwiki o ka laha ʻana o ka nalu he ...

1. 3 m / s
2. 6 m / s
3. 8 m / s
4. 12 m / s

Pahana
Ua ʻike ʻia:
Aia he 2 mau nalu e pili ana i ka pakuhi ma luna.
Ka mamao o 1 nalu (λ) = 6 mika / 2 = 3 mika.
Ka wā (T) = 0,5 kekona
Ua nīnau ʻia: Ka wikiwiki o ka nalu (v)
Pane:
v = f λ = λ / T = 3 mika / 0,5 kekona = 6 mika / kekona
ʻO ka pane pololei ʻo B.

Nā nalu lōʻihi

4. Hoʻokani ʻia nā kumu leo ​​ʻelua i ka manawa like ma ka mea like a me ka mahana. ʻO ke alapine (frequency) o ke kumu leo ​​mua he 640 Hz a ʻo ke kumu leo ​​ʻelua he 1280 Hz. ʻO ka ʻōlelo pololei….

1. ʻOi aku ka wikiwiki o ke kani mua ma mua o ka wikiwiki o ke kani ʻelua
2. ʻOi aku ka liʻiliʻi o ka wikiwiki o ke kani mua ma mua o ka wikiwiki o ke kani ʻelua
3. Ua like ka wikiwiki o ke kani mua a me ka lua
4. lōʻihi nā nalu kani ua like ka nui o nā mea ʻelua

Pahana
Aia ka wikiwiki o ke kani ma muli o ke ʻano waena, no laila inā like ke ʻano waena, e like nō ka wikiwiki o nā leo ʻelua. I ka ʻaoʻao ʻē aʻe, inā kiʻekiʻe ke alapine (frequency), e liʻiliʻi ka nalu, a pēlā nō hoʻi, inā haʻahaʻa ke alapine (frequency), e nui ka nalu. He ʻokoʻa nā alapine o nā leo ʻelua, no laila e ʻokoʻa nō hoʻi nā nalu o nā leo ʻelua.
ʻO C ka pane pololei.

Nā nalu paʻa (nā nalu kū)

5. ʻO ke kaula me nā wēlau ʻelua i hoʻopaʻa ʻia e hana i kahi leo kumu me ka alapine (frequency) o 420 Hz. ʻO nā alapine (frequency) o nā leo ʻekolu he….

1. 840 Hz
2. 1260 Hz
3. 1680 Hz
4. 2940 Hz

Pahana
Ua ʻike ʻia:
ʻO ke alapine kumu (f₁) = 420 Hz
Ua nakinaki ʻia nā wēlau ʻelua o ke kaula
Ua nīnau ʻia: ʻO ke alapine (frequency) o nā leo ʻekolu
Pane:
ʻO ke alapine (frequency) o ka lua o ke kani leo (f)₂) = 2 f₁ = 2 (420 Hz) = 840 Hz
ʻO ke alapine (frequency) o ke kolu o ke overtone (f₃) = 3 f₁ = 3 (420 Hz) = 1260 Hz
ʻO ka pane pololei ʻo B.

Nā nalu kani

6. Hōʻike ke kiʻi ma lalo nei i kahi bele uila i loko o kahi pā pani. A laila kani ʻia ka bele, e hoʻokuʻu ana i ka ea mai loko mai o ka pā. Ma hope o ka hoʻokuʻu ʻia ʻana o ka ea mai loko mai o ka pā, ʻaʻole lohe hou ʻia ke kani o ka bele. Ma muli o kēia hanana, hiki ke hoʻoholo ʻia ʻo ke kani...

1. ʻaʻole ia e hana ʻia ma kahi pani ʻia
2. i lawe ʻia e ka ea e puka mai ana mai loko mai o ke kapuahi
3. ʻaʻole hiki ke hoʻolaha i loko o kahi hakahaka
4. ʻaʻole hiki ke hoʻolaha ma o nā mea paʻa

Pahana
He nalu ke kani e holo ana ma o nā mea paʻa, nā wai, a me nā kinoea. Inā aia ka bele i loko o kahi hakahaka, ʻaʻole hiki i nā nalu kani ke hele mai ka bele a i ka pepeiao o ka mea hoʻolohe.
ʻO C ka pane pololei.

Puna nīnau:

Nā Nīnau OSN no ke Kino ʻana i ke Kula Kiʻekiʻe Haʻahaʻa