A electron has a mass 911x10-31kg of and a charge -e , Ask an Expert

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An electron has a mass 9.11x10^-31kg of and a charge -e = -1.60x10^-19C . Suppose electron moves in the vicinity of an alpha particle, which has charge +2e The alpha particle is over 7000 times as massive as the electron, so we assume that it is at rest in some inertial frame of reference. When the electron is 1.00x10^-10m from the alpha particle, it is moving directly away from the alpha particle at a speed of 3.00x10^6m/s. Calculate the distance between the electron and alpha particle when the electron comes momentarily to rest.

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