SETIAP HARI 5 SOALAN-13/11
Quiz
•
Physics
•
1st Grade
•
Practice Problem
•
Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Rajah 34 menunjukkan lengkung reputan bagi suatu bahan radioaktif.Berapakah separuh hayat bagi bahan radioaktif tersebut?
6 minit
12 minit
18 minit
24 minit
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Jisim awal bahan radioaktif adalah 8.0 g dan tempoh separuh hayatnya adalah 5 hari. Pernyataan manakah berikut berkenaan jisim bahan radioaktif adalah benar?
Jisim 5 hari sebelum adalah 16.0 g.
Jisim 10 hari sebelum adalah 64.0 g
Jisim 5 hari selepas adalah 2.0 g.
Jisim 10 hari selepas adalah 4.0 g.
Answer explanation
kena reverse ke belakang so akan jadi darab sebab dia sebelum.
8x2=16
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Persamaan berikut menunjukkan proses pereputan satu sampel Uranium-238.
238U ® 226Ra + X 4He + Y 0e
92 88 2 -1
Tentukan nilai X dan Y.
A
B
C
D
Answer explanation
Seimbangkan persamaan.
belah atas
238--226+4X+0Y
238--226+4X
4X=238-226
x=12/4
X=3
belah bawah
92--88+2(3)-Y
92--94-Y
Y=94-92
Y=2
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Di bawah ialah satu persamaan yang mewakili pereputan satu nukleus uranium.
238U -- 230Th + m 0e + n 4He
92 90 -1 2
Cari nilai m dan n.
m = 1, n = 2
m = 2, n = 2
m = 0, n = 1
m = 1, n = 1
Answer explanation
seimbangkan persamaan
belah atas
238--230+0m+4n
4n=238-230
n=2
belah bawah
92--90-1m+2(2)
92=90-m+4
m=94-92
m=2
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Persamaan berikut menunjukkan reputan U-235.
235U ® 231Th + 4 He
92 90 2
What is the mass that is converted to energy? Berapakah jisim yang telah ditukarkan kepada tenaga?
jisim U-235 = 235.0439 u, jisim Th-231 = 231.0363 u,
jisim zarah alfa = 4.0026 u,1u= 1.66x10-27 kg
7.8 x 10-27 kg
8.3 x 10-30 kg
7.5 x 10-13 kg
5.0 x 10-3 kg
Answer explanation
Cari cactat jisim dulu
U-(Th+alfa)
=235.0439-(231.0363+4.0026)
=5x10-3u
Nak cari tenaga kena darab dengan 1.66 x 10-27 kg
=5x10-3 x 1.66 x 10-27
=8.3 x 10-30 kg
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