4 mau laʻana o nā nīnau manawa alapine (frequency) a me ka haʻalulu
1. Haʻalulu ka mea A ma 75 mau haʻalulu i kekona, a haʻalulu ka mea B ma 60 mau haʻalulu i kekona. ʻO ka lakio o nā alapine (frequencies) o ka mea A i ka mea B he...
A. 6 : 7
B. 5 : 4
K. 4 : 5
D. 3 : 5
Pahana
ʻO ke alapine (frequency) ka helu o nā haʻalulu e hana ʻia ana i kēlā me kēia kekona.
Alapine (frequency) o ka mea A = 75/kekona = 75 Hertz
Alapine (frequency) o ka mea B = 60/kekona = 60 Hertz
ʻO ka lakio o nā alapine (frequencies) o ka mea A a me ka mea B penei:
75: 60
75/15 : 60/15
5: 4
ʻO ka pane pololei ʻo B.
2. ʻO ka helu o nā haʻalulu i loko o 1 kekona ua kapa ʻia ʻo…
A. ka nui o ka laulā
B. alapine (frequency)
wā C.
D. ka wā
Pahana
ʻO ka helu o nā haʻalulu e hana ʻia i hoʻokahi kekona ua kapa ʻia ʻo ke alapine haʻalulu, ʻoiai ʻo ka nui o ka manawa e pono ai e hana i hoʻokahi haʻalulu ua kapa ʻia ʻo ka wā.
ʻO ka pane pololei ʻo B.
3. Hoʻopuka kahi kumu haʻalulu i kahi alapine (frequency) o 20 Hz. ʻO ka wā o kēia haʻalulu he...
A. 20 kekona
B. 2 s
C. 0,5 kekona
D. 0,05 kekona
Pahana
Ua ʻike ʻia:
Alapine (f) = 20 Hertz
Ua nīnau ʻia: Wā (T)
Pane:
ʻO ke alapine (frequency) ka helu o nā haʻalulu e hana ʻia i hoʻokahi kekona, ʻoiai ʻo ka wā ka manawa e pono ai e hana i hoʻokahi haʻalulu.
T = 1/f
T = 1/20 Hz
T = 0,05 kekona
ʻO D ka pane pololei.
4. Inā haʻalulu kahi mea 600 haʻalulu i kēlā me kēia 5 mau minuke, a laila ʻo ka wā haʻalulu he...
A. 0,5 kekona
B. 2 kekona
C. 60 kekona
D. 120 kekona
Pahana
Ua ʻike ʻia:
Manawa (t) = 5 minuke = 5 x 60 kekona = 300 kekona
Helu o nā haʻalulu = 600 haʻalulu
Ua nīnau ʻia Ka wā haʻalulu (T)
Pane:
ʻO ke alapine (f) o ka haʻalulu ka helu o nā haʻalulu e hana ʻia i hoʻokahi kekona, ʻoiai ʻo ka wā (T) o ka haʻalulu ka manawa e pono ai e hana i hoʻokahi haʻalulu.
Alapine haʻalulu (f) = 600 haʻalulu / 300 kekona = 2 haʻalulu / kekona
Ka wā haʻalulu (T) = 300 kekona / 600 haʻalulu = 3 kekona / 6 haʻalulu = 1 kekona / 2 haʻalulu = 0,5 kekona/haʻalulu
ʻO A ka pane pololei.
Puna nīnau:
Nā Nīnau Hoʻokolohua ʻEpekema Lahui no ke Kula Kiʻekiʻe Haʻahaʻa/Kula Kiʻekiʻe ʻIslama
