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1. Atom radioaktif mereput untuk menjadi atom yang
stabil. Didapati selepas 288 s, 6.25 % atom tidak
mereput. Berapakah separuh hayat bahan itu?
100% → 50% → 25% → 12.5% → 6.25%
4T1/2 = 288
T1/2 = 72 s
1.Atom radioaktif mereput untuk
menjadi atom yang stabil. Didapati
selepas 288 s, 6.25 % atom tidak
mereput. Berapakah separuh hayat
bahan itu?
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2. Separuh hayat bagi iodine-131 ialah 8 hari. Satu bahan
radioaktif mengandungi 64 g iodine-131. Tentukan jisim iodine
yang belum mereput dan yang sudah mereput selepas 24 hari.
t = 24 /8 = 3T1/2
64 → 32 → 16 → 8
Jisim yang sudah mereput = 56 g
Jisim yang belum mereput = 8 g
2.Separuh hayat bagi iodine-131 ialah 8
hari. Satu bahan radioaktif mengandungi
64 g iodine-131. Tentukan jisim iodine
yang belum mereput dan yang sudah
mereput selepas 24 hari.
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6.1 SEPARUH HAYAT Cikgu Ilani 2021
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