
FISIKA INTI
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Physics
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nina margalena
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15 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Sebuah logam mempunyai frekuensi ambang 4 x 1014 Hz. Jika logam tersebut dijatuhi foton ternyata elektron foton yang dari permukaan logam memiliki energi kinetik maksimum sebesar 19,86 × 10-20 Joule. Hitunglah frekuensi foton tersebut! (h = 6,62 × 10-34 Js)
5 × 1014 Hz
6 × 1014 Hz
7 × 1014 Hz
8 × 1014 Hz
9 × 1014 Hz
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Sebuah benda dengan luas permukaan 100 cm2 bersuhu 727oC. Jika koefisien Stefan-boltzman 5,67 x 10-8 W/mK4 dan emisivitas benda adalah 0,6. Tentukan laju rata – rata energi radiasi benda tersebut!
170,1 J/s
340,2 J/s
640,4 J/s
1280,8 J/s
2561,6 J/s
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Sebuah benda dengan luas permukaan 100 cm2 bersuhu 727oC. Jika koefisien Stefan-boltzman 5,67 x 10-8 W/mK4 dan emisivitas benda adalah 0,6. Tentukan laju rata – rata energi radiasi benda tersebut!
170,1 J/s
340,2 J/s
640,4 J/s
1280,8 J/s
2561,6 J/s
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Panjang gelombang radiasi maksimum suatu benda pada suhu T Kelvin adalah 6000 A. Jika suhu benda naik hingga menjadi 3/2 T Kelvin. Tentukan panjang gelombang radiasi maksimum benda!
1000 A
2000 A
3000 A
4000 A
5000 A
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Hitunglah energi dari suatu foton cahaya biru dengan panjang gelombang 450 nm
4,42 x 10-19 J
1,42 x 10-19 J
2,42 x 10-19 J
3,42 x 10-19 J
5,42 x 10-19 J
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Untuk memutuskan ikatan kimia di dalam molekul-molekul kulit manusia yang menyebabkan luka terbakar sinar matahari, dibutuhkan sebuah energi foton kira kira 3,50 eV. Berapakah panjang gelombangnya?
354 nm
123 nm
345 nm
456 nm
768 nm
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
1. Energi kinetik foto elektron berkisar dari nol hingga 50 x 10-19 J. bila cahaya dengan panjang gelombang 3000Ǻ jatuh pada sebuah permukaan. Berapakah potensial henti cahaya ini?
3,13 eV
2,12 eV
4,14 eV
5,15 eV
6,16 eV
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