Page 75 - Hybrid PBD KSSM 2021 Tg 5 - Fizik

Fizik Tingkatan 5 Bab 6
Pentaksiran Sumatif
SPM

Praktis PdPR Jawapan Praktis PdPR
Bab 6 Bab 6

Kertas 1 3. Rajah 2 menunjukkan persamaan pereputan bagi
thorium-232.
Diagram 2 shows the decay equation for thorium-232.
1. Persamaan berikut mewakili pereputan alfa. 232 232
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The following equation represents alpha decay. 90 Th → U + Xβ
92
4
X → Z + 2He Rajah 2 / Diagram 2
Antara berikut, yang manakah betul mengenai Berapakah bilangan zarah beta yang terhasil?
unsur Z? What is the amount of beta particle produced?
Which of the following is correct about element Z? A 1
B 2
Nombor proton Nombor nukleon C 3
Proton number Nucleon number D 4
A Bertambah 4 Bertambah 4 4. Rajah 3 menunjukkan proses pereputan bagi
Increases by 4 Increases by 4 plumbum-214 dengan menghasilkan Y dan Z.
B Bertambah 2 Tidak berubah Diagram 3 shows the decay process of plumbum-214 by
Increases by 2 No change producing Y and Z.
214
214 Pb → Bi + Y → Po + Z
214
C Bertambah 2 Bertambah 4 82 83 84
Increases by 2 Increases by 4 Rajah 3 / Diagram 3
D Berkurang 4 Berkurang 2 Apakah Y dan Z?
Decreases by 4 Decreases by 2 What are Y and Z?

2. Rajah 1 menunjukkan persamaan bagi pereputan Y Z
nukleus Z. α α
Diagram 1 shows the equation for the decaying of nucleus Z. A
B α β
4
Z → A + 2He
226
88
C β β
Rajah 1 / Diagram 1
D β α
Berapakah bilangan proton dan neutron dalam
nukleus Z? 5. Aktiviti sampel unsur radioaktif Z menjadi 12.5%
What is the number of protons and neutrons for nucleus Z? daripada nilai asal selepas 150 minit.
The actitivity of radioactive element sample Z becomes 12.5%
Neutron Proton of its initial value after 150 minutes.
Neutrons Protons
100% → 50% → 25% → 12.5%
A 90 140
Berapakah separuh hayat bagi unsur radioaktif Z
B 140 90 tersebut?
What is the half-life for the radioactive element Z?
C 230 90 A 30 minit / 30 minutes

D 90 230 B 50 minit / 50 minutes
C 70 minit / 70 minutes
D 150 minit / 150 minutes

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Bab 6.indd 183 11/19/21 3:33 PM