In an α−particle scattering experiment, α−particles of equal kinetic energy strike on a metal foil. If a large number of α−particles go undeviated and have a small deflection, that means,
A
the atomic number of the atoms in the foil is small.
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B
the atomic number of the atoms in the foil is large.
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C
the nucleus of the atoms in the foil is larger.
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D
the nucleus of the atoms in the foil is smaller.
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Solution
The correct option is A the atomic number of the atoms in the foil is small. The α−particles are scattered due to the force of repulsion experienced by them due to the presence of positive charge present in the nucleus.
If a large number of α−particles go undeviated and have a small deflection, clearly the magnitude of positive charge in the nucleus is smaller.