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A moving charge gives rise to a magnetic field, and if the motion is changing (accelerated), then the magnetic field varies and in turn produces an electric field......radiation sickness,harmful effect produced on body tissues by exposure to radioactive substances.Some of them have orbits that cross the orbits of the planets and moons.When they get close enough to a planet or moon, they will be pulled in by the large body's gravity and strike the surface at a speed of at least the escape velocity of the planet or moon, i.e., faster than a bullet.Since its radioactivity presents a serious health hazard (see radiation sickness), disposing of such material is a great problem......

nucleus,in physics, the extremely dense central core of an atom.Thanks to Astronomy Notes reader Katie Cook for locating several of these resources.Here's a chart explaining the basics of radioactive decay.Much to his surprise, the paper was darkened as if it had been exposed to the sun.Becquerel concluded that the uranium must be emitting some sort of high energy. Later, Becquerel demonstrated that the radiation emitted by uranium was similar to X rays but, unlike X rays, could be deflected by a magnetic field and therefore must consist of charged particles.On the surface, radiometric dating methods appear to give powerful support to the statement that life has existed on the earth for hundreds of millions, even billions, of years.