9. Coulomb force between the nucleus (with atomic number Z) and an electron at an...

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9. Coulomb force between the nucleus (with atomic number Z) and an electron at an orbit of radius r = Ze/r10. Assuming the nucleus being at rest, total energy of an atom E= - kee/2r)Energy levels (En) for electrons at different stable orbits, En = -(meke2e4/2hn), h=h/2?. En = -(13.6)eV11. Proton mass mp = 1.007825 unit, neutron-mass mn = 1.008665 unit. Mass-energy equivalence: 1 unit converts to 931.5 MeV/c12. For radioactive decay, ?N/?t = -?t, N? nuclei not decayed. Half-life T1/2= 0.693/?, ?? decay constant13. 1 u of mass=931.5 MeV of energyQuestion 8An object is placed at a distance 6 cm in front of a concave mirror with f = 15 cm. What is the magnification? (use the absolute values)2.91.72.53.0

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