Question

If the nuclear fission, piece of uranium of mass $5.0g$ is lost, the energy obtained in $kWh$ is

• A. $1.25\times {10}^7$
• B. $2.25\times {10}^7$
• C. $3.25\times {10}^7$
• D. $0.25\times {10}^7$

Answer 1

The correct option is A $1.25\times {10}^7$

As we know, energy $E=\Delta m{c}^2$
$=0.5\times {10}^{-3}\times {(3\times {10}^8)}^2$
$=4.5\times {10}^{13}J$
$=\frac{4.5\times {10}^{13}}{3.6\times {10}^6}=1.25\times {10}^{7}kWh$