A 12 KV 480120 60 Hz real transformers R 24 ohm Re 243 K o

A 1.2 KV. 480/120, 60 Hz real transformers R = 2.4 ohm, Re = 2.43 K ohm X_m = 486 ohm X_R rightarrow o full loaded and rated voltage for output with p.f = 1

Solution

Alpha particles, like helium nuclei, have a net spin of zero. Due to the mechanism of their production in standard alpharadioactive decay, alpha particles generally have a kinetic energy of about 5 MeV, and a velocity in the vicinity of 5% the speed of light. (See discussion below for the limits of these figures in alpha decay.) They are a highly ionizing form of particle radiation, and (when resulting from radioactive alpha decay) have low penetration depth. They are able to be stopped by a few centimeters of air, or by the skin. However, so-called long range alpha particles from ternary fission are three times as energetic, and penetrate three times as far. As noted, the helium nuclei that form 10–12% of cosmic rays are also usually of much higher energy than those produced by nuclear decay processes, and are thus capable of being highly penetrating and able to traverse the human body and also many meters of dense solid shielding, depending on their energy. To a lesser extent, this is also true of very high-energy helium nuclei produced by particle accelerators.