4. The Bohr model (Neils Bohr, 1913) treats the hydrogen atom as a minature solar system. Although the model isincorrect it provided early insight into the quantum mechanics of atoms. Assume the electron (mass m, charge -e)is in a circular orbit of radius r around the proton (charge +e, mass M). M » m so the proton is stationary.From Physics 211, a object moving in a circle at constant speed will experience a centripetal acceleration v2 /rdirected toward the center of the circle. Use circular motion dynamics to determine the speed of the electron inorbit. Answer in terms of r, e, m and/or M. Gravitational forces are negligible at the atomic level.а.b. What is the kinetic energy of the electron in orbit? Answer in terms of e,r and/or m.

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