a nuclear physicist studies the particles ejected by a beam of radioactive nuclei . according to proposed theory the average rates at which particles are ejected in the forward and backward directions should be equal. to test this theory a scientist counts the total
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During beta decay, it is observed that electrons are ejected from the atomic nucleus. We assume that the electrons are somehow trapped inside the nucleus, and that occasionally one escapes and is observed in the laboratory. Take the diameter of a typical nucleus to be 1Ă—10-14m, and use the uncertainty principle to estimate the range of kinetic energies that said electron must have.
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Adi S.
In 1911, Ernest Rutherford and his assistants Geiger and Marsden conducted an experiment in which they scattered alpha particles (nuclei of helium atoms) from thin sheets of gold. An alpha particle, having charge +2e and mass 6.64 x 10-27 kg, is a product of certain radioactive decays. The results of the experiment led Rutherford to the idea that most of the atom’s mass is in a very small nucleus, with electrons in orbit around it. (This is the planetary classic model.) Assume an alpha particle, initially very far from a stationary gold nucleus, is fired with a velocity of 2.00 x 107 m/s directly toward the nucleus (charge +79e). What is the smallest distance between the alpha particle and the nucleus before the alpha particle reverses direction? Assume the gold nucleus remains stationary.
Timothy J.
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