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The K.E. of an electron in 3rd orbit of H like species is 6.04eV. The area of 3rd orbit for such species is??
The Kinetic energy is given.Energy = 13.6z^2/9 = 6.04we get z = 2.Radii = 0.5209 * 9/2 = > 2.34405 A.Area = pi*2.34405*2.34405 in Angstrom^2would be the apprroximate area.(approximating to circlar orbit.)
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