Description: After studying this lesson, you should be able to learn about, Rutherford’s scattering experiment and its findings, Rutherford’s atomic model and state its shortcomings, calculate the radius of Bohr’s first orbit and velocity of an electron in it, an expression for the energy of an electron in a hydrogen atom, the energy level diagram of a hydrogen atom and explain its spectrum, the production,properties, types and uses of x-rays, Mosley law and Duane-Hunt law