Electron and it's Discovery

Physics

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Rutherford's model of an atom

To study the structure of atom, Rutherford performed a thin gold foil scattering experiment. For his experiments Rutherford used a gold foil. He made a narrow beam of alpha particles to fall on the gold foil. Observations made from the alpha ray scattering experiment: Most of the alpha particles passed straight through the gold foil without getting deflected, a small fraction of the alpha particles were deflected through small angles, a few alpha particles bounced back.

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Rutherford's nuclear model of atom

In Rutherford's nuclear model of the atom, the entire positive charge and most of the mass of the atom are concentrated in the nucleus with the electrons some distance away. The electrons would be moving in orbits about the nucleus just as the planets do around the sun. Rutherford's experiments suggested the size of the nucleus to be about m to m.

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Important Questions

Explain Rutherford's -ray scattering experiment with a neat diagram.

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Rutherford's alpha-particle scattering experiment was responsible for the discovery of:

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The total energy of an electron in the first excited state of the hydrogen atom is about .
(a) What is the kinetic energy of the electron in this state?
(b) What is the potential energy energy of the electron in this state?
(c) Which of the answers above would change if the choice of the zero of potential energy is changed?

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Using Rutherford model of the atom, derive the expression for the total energy of the electron in hydrogen atom. What is the significance of total negative energy possessed by the electron?
OR 
Using Bohr's postulates of the atomic model derive the expression for radius of nth electron orbit. Hence obtain the expression for Bohrs radius.

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The total energy of an electron in the first excited state of the hydrogen atom is -3.4 eV. Find out its (i) kinetic energy and (ii) potential energy in this state.

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What are the postulates of Rutherford? What are his drawbacks ?

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The conclusions of Rutherford's scattering experiment are:

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The energy of the electron in the ground state of hydrogen atom is -13.6 eV. Find the kinetic energy and potential energy of electron in this state.

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If the nuclear radius of is Fermi, the approximate nuclear radius of in Fermi is

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What were the three major observations Rutherford made in the gold foil experiment?

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