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large radioactive atoms often decay by alpha particle emission. the alpha particle is emitted at a...

large radioactive atoms often decay by alpha particle emission. the alpha particle is emitted at a speed of 1.5 * 10^4 km/s. given that an alpha particle is a helium-4 nucleus, what is the kinetic energy of the emitted alpha particle?

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Answer #1

speed = 1.5 x 10^4 km / sec

           = 1.5 x 10^7 m / sec

mass of alpha particle = 6.644 x 10-27 kg

kinetic energy = 1/2 * m * v^2

                       = 1/2 * 6.644 x 10-27 x   (1.5 x 10^7)^2

                       = 7.5 x 10^-13 J

kinetic energy = 7.5 x 10^-13 J

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