6.1 SEPARUH HAYAT Cikgu Ilani 2021

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3. Satu sampel plumbum-211 berjisim 96 g mempunyai separuh hayat
36.1 minit.

(a) berapakah bahagian sampel yang tidak mereput selepas 108.3
minit?

(b) Berapakah jisim produk yang telah mereput selepas masa tersebut?

108.3 / 36.1 = 3 T1/2
96 g → 48 g → 24 g → 12 g

Jisim yang tidak mereput = 12 g

Jisim yang telah mereput = 84 g

3. Satu sampel plumbum-211 berjisim 96 g
mempunyai separuh hayat 36.1 minit.

(a) Berapakah bahagian sampel yang tidak
mereput selepas 108.3 minit?

(a) Berapakah jisim produk yang telah
mereput selepas masa tersebut?

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4. Aktiviti bagi satu sampel bahan radioactif dikurangkan ke 1/16
daripada nilai asal selepas 156 minit. Berapakah separuh hayat
sampel itu?

1 → 1/2 → 1/4 → 1/8 → 1/16
4T1/2 = 156
T1/2 = 39 minit

4. Aktiviti bagi satu sampel bahan
radioaktif dikurangkan ke 1/16 daripada
nilai asal selepas 156 minit. Berapakah
separuh hayat sampel itu?

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WAN

5. Aktiviti sampel X menjadi 6.25% daripada nilai asal selepas 120 minit.
Berapakah separuh hayat?

4T1/2 = 120 min T1/2 = 30 min

5. Aktiviti sampel X menjadi 6.25%
daripada nilai asal selepas 120 minit.

Berapakah separuh hayat?

6. Rajah 10.2.12 menunjukkan lengkung pereputan untuk
satu sampel bahan radioaktif.

(a)Berapakah separuh hayat sampel itu?

25 minit

…………………………………………………

(a)Nyatakan nilai T.

…7…5…m…in…it………………………

6. Rajah 10.2.12 menunjukkan lengkung pereputan untuk
satu sampel bahan radioaktif.

(a)Berapakah separuh hayat sampel itu?

…………………………………………………

(a)Nyatakan nilai T.

……………………………………

Short Answer Submissions (all)

Syazwan Yang a)25 m
Kacak b)75 m
Bee San
a. 25 minit
nur faqihah b. 1T = 25 minit
Chang Wei Jie
3T = 3(25) = 75 minit
pei xin
a) 25 minit
b) 1T = 25 minit

3T = 75 minit

a)25 minit b)75minit

a) 25 minit
b) 1600 -> 800 -> 400 -> 200
I T = 25 minit
3 T = 25(3)
3 T = 75 minit

Short Answer Submissions (all)

NUR ALIESYA a) 25 minit
ADRIANA b) 3T = 3(25)
hong yao
= 75 minit
Nazura
a)25minit
Zoe Yu b)75minit

a) 25 minit
b) 3T=3(25)

= 75 minit

a) 25 minit
b) 3T = 3 (25)

= 75 minit

Short Answer Submissions (all)

Bee San a. 25minit
b. 75minit
Chyntiavy
Muhammad 25 minit
Nazhan 75 minit
Tan Yu Mi
a) 25 b) 75
Muhd Mahadir
Yaacob a)25min
b)75 min

a) 25 minit
b) 1T = 25

2T = 3(25)
= 75 minit

Short Answer Submissions (all)

ming wei a) 25 minit
b)1T=25

3T=3(25)
3T= 75minit

8.Rajah menunjukkan graf bilangan nukleus
radioaktif melawan masa untuk satu sampel
radioaktif Q.

(a)Tentukan separuh hayat bahan radioaktif Q.

15 minit

(b)Tunjukkan pada graf bagaimana anda
menentukan separuh hayat.

(c)Berapakah bilangan nukleus radioaktif 45 / 15 = 3T1/2
yang belum mereput selepas 25 minit. 100 → 50 → 25 → 12.5

0.4 x 106 12.5% yang tinggal.

(d)Hitungkan peratus bilangan nukleus
radioaktif yang masih tinggal selepas 45
minit.

(b)Tunjukkan pada graf bagaimana anda menentukan separuh hayat.

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