Answer to Question #160628 in Quantum Mechanics for Mark C. Radcliff

Question

What is the mean mass of the Earth converted to pure energy.

Answer 1

$E=mc^2\to m=E/c^2$

To determine the mass it is necessary to know the energy consumed. If $E\approx10^{20}\ J$ then

$m=10^{20}/(3\cdot10^8)^2=1111\ (kg)$ . Answer