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When an alpha particle collides elastically with a nucleus, the nucleus recoils. Suppose a 4.35 MeV...

When an alpha particle collides elastically with a nucleus, the nucleus recoils. Suppose a 4.35 MeV alpha particle has a head-on elastic collision with a gold nucleus that is initially at rest. What is the kinetic energy of (a) the recoiling nucleus and (b) the rebounding alpha particle? The gold nucleus has a mass of 197 u and the alpha has a mass of 4.0 u.

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