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Question

In an αparticle scattering experiment, αparticles of equal kinetic energy strike on a metal foil. If a large number of αparticles 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 αparticles 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 αparticles go undeviated and have a small deflection, clearly the magnitude of positive charge in the nucleus is smaller.

Hence, (A) is the correct answer.

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