Persamaan di bawah menunjukkan
radium -226 mereput. Daripada
persamaan, radium membebaskan zarah α
dan zarah β untuk menghasilkan polonium- 210
|
(a)
|
Find the value of m and n
|
|
|
Cari nilai m dan n
|
|
|
m = …………………………………. n = ………………………………
|
|
|
|
[ 2 marks / markah]
|
|
(b)
|
Write the
numbers of proton and neutron of polonium – 210.
|
|
|
Tuliskan bilangan proton dan bilangan neutron bagi polonium – 210
|
|
|
Proton : ………………………..
|
|
|
Neutron : ………………………
|
|
|
|
[ 2 marks / markah]
|
|
(c)
|
The nuclear reaction of one nucleus of radium -226 experiences a
mass defect of 3.5
× 10-20 kg. The speed of light , c is 3 × 108
ms-1. Calculate the
energy released in the reaction.
|
|
|
Tindakbalas nuclear bagi satu nucleus radium -226 mengalami kecacatan
jisim sebanyak 3.5 × 10-20 kg . Halaju cahaya, c adalah 3 × 10 8
ms-1 . Hitung tenaga yang
dibebaskan dalam tindakbalas itu.
|
|
|
|
|
|
|
|
[ 2 marks / markah]
|
|
(d)
|
In an experiment using a radioactive substance P , the number of
counts recorded was 10000. 1 hour
later, the experiment was repeated and the number of counts recorded was
1250.
|
|
|
Dalam satu eksperimen menggunakan bahan radioactive P, bilangan
dicatatkan adalah 10 000.
Selepas satu jam, eksperimen diulangi dan bilangan dicatatkan 1250.
|
|
|
(i)
|
Determine the half life of radioactive substance P.
|
|
|
|
Tentukan separuh
hayat bagi bahan radioactive P
|
|
|
|
[ 2 marks / markah]
|
|
|
(ii)
|
Predict the number of counts of substance P after 2 hours
|
|
|
|
Ramalkan bilangan
bahan P selepas 2 jam.
|
|
|
|
|
|
|
|
[ 1 mark / markah]
|
m = 4
n = 4
|
Proton
= 84
Neutron
= 126
|
3.5 x 10-20 x (3
x 108 )2
|
3.15 x 10-3 J (with unit)
|
3T½
|
⅓ hour// 0.33 hour (with unit)
|
156
|
|
