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Why did Rutherford select a gold foil in...

Why did Rutherford select a gold foil in his `alpha`-ray scattering experiment ?

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Gold is a heavy metal with high mass number. A light metal cannot be used because on being hit by fast moving `alpha`-particle, the atom of light metal will be simply pushed forward and no scattering can occur.
Moreover, gold is the best malleable metal. A very thin foil (`~~ 1000` atoms thick) can be made from gold to get the clear observations.
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Knowledge Check

  • The particle used by Rutherford in alpha -ray scat­tering experiment was

    A
    neutron
    B
    electron
    C
    helium nucleus
    D
    X rays

  • Which of the following conclusions could not be derived from Rutherford's is alpha - ray scattering experiment?

    A
    Most of the space in the atom is empty
    B
    The radius of the atom is about `10^(-10)m` while that of nucleus is `10^(15)`m
    C
    Electrons move in a circular path of fixed energy called orbits
    D
    Electrons and the nucleus are held together by electrostatic forces of attraction

  • Thickness of the foil of gold used in alpha -particle scattering experiment is

    A
    `2.1xx10^(-7)` m
    B
    `3.5xx10^(-5)` m
    C
    `2.1xx10^(-9)` m
    D
    `3.5xx10^(-6)` m

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