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A single uranium atom has a mass of 3.97-10-25kg. It decays into the nucleus of a thorium atom by emitting an alpha particle at

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A single uranium atom has a mass of 3.97-10-25kg. It decays into the nucleus of a thorium atom by emitting an alpha particle at a speed of 2.10*10 The mass of an alpha particle is 6.68 - 1027kg. What is the recoil speed of the thorium nucleus? S

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