To calculate the amount of energy released when 0.5 kg of uranium is completely burnt, we use Einstein's mass-energy equivalence formula: \(E = mc^2\) Given: Mass of uranium (\( m \)) = 0.5 kg, Speed of light (\( c \)) = \( 3 \times 10^8 \, \text{m/s} \) Substituting the values into the formula: \(E = 0.5 \, \text{kg} \times (3 \times 10^8 \, \text{m/s})^2\) Calculating \( c^2 \): \((3 \times 10^8)^2 = 9 \times 10^{16} \, \text{m}^2/\text{s}^2\) Now, substituting back: \(E = 0.5 \times 9 \times 10^{16} = 4.5 \times 10^{16} \, \text{J}\) The amount of energy released when 0.5 kg of uranium is burnt completely is \(E = 4.5 \times 10^{16} \, \text{J}\)