Question 363: Atoms & Nuclei

Question

The mass defect in a particular reaction is $$0.4 \mathrm{~g}$$. The amount of energy liberated is $$n 	imes 10^7 \mathrm{~kWh}$$, where $$n=$$ __________. (speed of light $$\left.=3 	imes 10^8 \mathrm{~m} / \mathrm{s}ight)$$

Accepted Answer

$$\begin{aligned}
& \mathrm{E}=\Delta \mathrm{mc}^2 \
& =0.4 	imes 10^{-3} 	imes\left(3 	imes 10^8ight)^2 \
& =3600 	imes 10^7 \mathrm{kWs} \
& =\frac{3600 	imes 10^7}{3600} \mathrm{kWh}=1 	imes 10^7 \mathrm{kWh}
\end{aligned}$$

Atoms & Nuclei

The mass defect in a particular reaction is $0.4 \mathrm{~g}. The amount of energy liberated is n \times 10^7 \mathrm{~kWh}, where n= __________. (speed of light \left.=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)

Choose the correct answer: