7. An alpha particle (two protons, two neutrons) moves into a stationary gold atom (79 protons, 118neutrons), passing through the electron region that surrounds the gold nucleus like a shell and headeddirectly toward the nucleus (Fig. below). The alpha particle slows until it momentarily stops when itscenter is at radial distance r =9.23 fm from the nuclear center. Then it moves back along its incoming path.What was the kinetic energy Ki of the alpha particle when it was initially far away? Assume that the onlyforce acting between the alpha particle and the gold nucleus is the (electrostatic) Coulomb force and treateach as a single charged particle.AlphaparticleGoldnucleusLightshotLightshot A ctivato Windc

Given Alpha particle q1 = 2e Gold atom protons q2 = 79 e Gold atom neutrons = 118…

Answered: An alpha particle (two protons, two…

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