Physics Homework Help? Can not figure out 5 questions

Posted on 2014-03-25 07:51:00 in Physics by ROGELIO

1.The size of Rutherford's atom is about 0.1 nm.

(a) Calculate the attractive electrostatic force between an electron and a proton at that distance.

in N



(b) Calculate the electrostatic potential energy of that atom. Express the result in unit eV.

in eV



(c) The size of Rutherford's atomic nucleus is about 1 fm. Calculate the repulsive electrostatic force between two protons at that distance.

in N



(d) Calculate the electrostatic potential energy of a pair of protons in such a nucleus. Express the result in unit MeV.

in MeV









2.What is the wavelength of light that can cause a transition of an electron in the hydrogen atom from the orbit with

n = 4 to n = 9?



in µm



3.The size of Rutherford's atom is about 0.1 nm.

(a) Calculate the speed of an electron that moves around a proton, based on their electrostatic attraction, if they are separated by 0.1 nm.

in m/s



(b) Calculate the corresponding de Broglie wavelength for Rutherford's electron.



4.How much energy is required to ionize hydrogen when it is in the state with

n = 2? in eV



5.Calculate for Bohr's atomic model the speed of the orbiting electron in the

n = 2



in m/s

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