
OSK ASTRONOMI 2018
Authored by Ririn Wijiastuti
Physics
10th Grade
Used 191+ times

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14 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Nilai dari persamaan berikut adalah…
-1
0
1
tidak terhingga
tidak ada solusi
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Terdapat 28 bintang dalam suatu daerah berbentuk segitiga yang dibatasi oleh tiga titik: A (2 pc, 0, 0), B (0, 4 pc, 0), dan C (0, 0, 6 pc). Jumlah bintang per pc² daerah tersebut adalah
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Pengamatan spektroskopik Supernova Remnant pada rentang panjang gelombang sinar-X menunjukkan garis-garis emisi bukti peluruhan atom Titanium-44 (⁴⁴Ti). Diketahui massa awal atom ⁴⁴Ti tersebut 3,1 x 10ˉ⁴ Mʘ, waktu paruh atom tersebut 60 tahun, dan umur Supernova Remnant sekitar 5000 tahun. Tentukanlah berapa kelimpahan atom ⁴⁴Ti saat ini.
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Suatu percobaan dilakukan di permukaan Planet Mars. Pada percobaan tersebut, gelas tabung terbuka<br />dengan jejari 1 cm diisi dengan 2 cm minyak dan 3 cm air. Tentukan tekanan di dasar gelas tabung<br />tersebut. (Massa jenis minyak=0,82 ρ air)
5.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Atom Hidrogen terdiri dari proton dan elektron orbital. Jika jarak antara keduanya adalah 5,3x10ˉ¹¹ m dan elektron bergerak dalam orbit lingkaran, hitunglah kecepatan orbit elektron.
6.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Which statement best describes the position of the Sun at sunrise and sunset as seen by an observer in northern hemisphere on June 21?
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Bentuk umum geometri bintang adalah bola. Selain itu, hampir seluruh materi di bintang bertahan, terkumpul, dan tetap terikat dalam bintang. Kesetimbangan terjadi di bintang antara gaya gravitasi ke arah pusat bintang dan tekanan gas (dan tekanan radiasi) ke arah permukaan bintang. ekanan gas tersebut
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