LASER Light Amplification by Stimulated Emission of Radiation
MASER Microwave Amplification by Stimulated Emission of Radiation
X-ray Lasers Stimulated Emission of Radiation in the X-ray spectrum
See a pattern, here? Light means anything within the visible spectrum. Microwaves are longer than light waves. X-rays are shorter than visible light.
Wiki: "resonance"
In physics, resonance is the tendency of a system to oscillate with larger amplitude at some frequencies than at others. These are known as the system's resonant frequencies. At these frequencies, even small periodic driving forces can produce large amplitude oscillations, because the system stores vibrational energy.
This means that your energy calculations are moot. If you select the right wavelength of energy, you can destroy anything with very little energy input, relative to the destruction. Tesla said he could destroy the Empire State Building with a 25 horsepower machine.
Check out the History Channel's "The Invisible Machine: Electromagnetic Warfare".
http://video.google.com/videoplay?docid=4515534125267138757#