31. Planck force is often useful in scientific calculations as a ratio of electromagnetic energy per gravitational length. 32. Also with his electromagnetic energy he can create a force field around himself rendering him virtually invincible. 33. By contrast, ionizing electromagnetic energy , such as is found in X-rays, is known to permanently damage tissue. 34. A body at temperature radiates electromagnetic energy . 35. In classical physics, anytime a charged particle is accelerated, it will radiate electromagnetic energy ( photons ). 36. For years, studies have overwhelmingly disputed a cancer risk from the low-level electromagnetic energy of cell phones. 37. Electromagnetic energy emitted by the scatterometer reflected off very tiny waves on the ocean called capillary waves.38. By contrast : a negative electric charge orbiting a positive electric charge will always radiate electromagnetic energy . 39. So for something like a satellite, how much power can they radiate in the form of electromagnetic energy ? 40. These observables generally take the form of emitted or reflected energy, such as electromagnetic energy or mechanical energy.