Question
38 Dalam suatu tindak balas pembelahan, 0.09% daripada jisim uranium-235 ditukarkan kepada tenaga. Hitungkan tenaga yang dibebaskan apabila 1 g uranium-235 dibelahkan di dalam sebuah reactor nuklear.
In a fission reaction, 0.09% of the mass of uranium-235 is changed to nuclear energy. Calculate the energy released when 1 g of uranium-235 is fissioned in a nuclear reactor.
[ Laju cahaya, c = 3 x 10^8 ms ^{-1} ]
[ Speed of light, c = 3 x 10^8 ms ^{-1} ]
A 2.7 x 10^2 J
B 2.7 x 10^5 J
C 8.1 x 10^{10} J
D 8.1 x 10^{15} J
Answer
Hi Farhaini, your approach is correct, I think you forgot to convert the g to kg.
1g = 1 \times 10^{-3} kg
0.09\% \times 10^{-3} kg = 9 \times 10^{-7} kg
E=mc^2= 9 \times 10^{-7} \times (3 \times 10^8)^2=8.1 \times 10^{10} J
Hope this helps! 
Ohhh I see Thank you vry much !
