
Latihan 8 akhir
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Science
8th Grade
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30 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Sebuah beban digantungkan di ujung pegas kemudian di ayunkan hingga bergerak harmonis. Jika beban berayun sebanyak 5 kali dalam 20 sekon, maka periode getarannya adalah …
2 sekon.
2.5 sekon.
5 sekon.
4.5 sekon.
Answer explanation
periode = waktu/ jumlah getaran
T = t/n
= 25/5
= 5 sekon
2.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Yoga menghitung benda yang bergetar setiap satu sekon terjadi 15 getaran. Banyaknya getaran yang terjadi dalam satu sekon disebut …
Amplitudo.
Periode.
Frekuensi.
Mikrometer.
Answer explanation
Banyaknya getaran yang terjadi dalam satu sekon
banyak getaran brrti n, 1 sekon itu t kecil
jawabannya frekuensi = n/ t
fanta
f=n/t
3.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Sebuah bandul mampu bergetar hingga 2000 getaran dalam waktu 20 sekon. Frekwensi getaran bandul tersebut adalah…
20 Hz.
25 Hz.
100 Hz.
60 Hz.
Answer explanation
Dik: n = 2000 getaran
t = 20 sekon
Dit: f=?
Jwb: f=n/t = 2000/20 = 100 Hz
4.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Gelombang dibedakan menjadi gelombang mekanik dan gelombang elektromagnetik. Perbedaan ini terutama didasarkan pada…
Cepat rambat gelombang.
Media perambatan gelombang.
Arah rambat gelombang.
Frekwensi gelombang.
5.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Contoh gelombang yang termasuk pada gelombang longitudinal adalah…
Gelombang bunyi.
Gelombang tali.
Gelombang Cahaya.
Gelombang air laut.
6.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Cepat rambat gelombang yang frekuensinya 75 Hz dan panjang gelombangnya 200m adalah…m/s
0.15
25
375
15000
Answer explanation
kecepatan (v) = panjang gelombang (λ) / periode (T) atau v = λf
Dik: λ= 200 m
f=75 Hz
Dit: v=?
Jwb: v=λf = 200x 75 = 15.000 m/s
7.
MULTIPLE CHOICE QUESTION
45 sec • 3 pts
Gelombang yang arah getarannya tegak lurus dengan arah rambatanya disebut gelombang…
Elektromagnetik.
Mekanik.
Longitudinal.
Transversal.
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