Page 376 - MODUL SPEKTRUM FIZIK SPM

Question Answer Remark Marks
Soalan Jawapan Catatan Markah
12(a)(i) Time for a radioisotope to disintegrate / decay Reject : …value
until it becomes half of its original activity / mass 1
Masa untuk radioisotope mereput sehingga
menjadi separuh daripada aktivit / jisim asal
(ii) Negatively charged / Medium penetrating power / -
Medium ionising power
Bercas negative / kuasa penembusan sederhana / 1
kuasa pengionan sederhana

(iii) Geiger Muller tube // GM tube - 1
Tiub Geiger Muller // tiub GM
800 → 400 → 200 → 100 → 50 Mark 1 : idea of 4 half lives
// 4 half life // 4 X 14
4 separuh hayat 2
56 days
Mark 2 : Answer with correct unit
(c)
Aspect Explanation
1. Solid state 2. Easy to handle
Pepejal Mudah dikendali

3. Gamma ray 4. High energy / Can sterilise // kill 8
Sinar gama pests
Tenaga tinggi / boleh membasmi / membunuh perosak
5. Long half life 6. Lasts longer / Saves cost
Separuh hayat panjang Tahan lama / jimat kos
7. Cobalt-60 is most suitable
Kobalt-60 paling sesuai
(d)(i) Mark 1 Nuclear fusion / pelakuran nuklear
Mark 2 Deuterium fuses with tritium / deuterium bergabung dengan tritium
Mark 3 Mass loss / mass defect changes into energy 4
Kehilangan jisim / cacat jisim berubah kepada tenaga
Mark 4 1 2 H  1 3 H 2 4 He 0 1 n  energy/ tenaga

(ii) Mark 1 m = (2.014102 + 3.016050) – (4.002603 + 1.008665) OR 0.018884 u OR
3.13 X 10 –29 kg
8 2
2
Mark 2 E = mc = (3.13 X 10 –29 ) (3 X 10 ) 3
13
Mark 3 = 2.82 X 10 J
20

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