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If the radius of the first Bohr orbit of hydrogen is , what is the radius of the third Bohr orbit of ?
r_1/3
r_1
3r_1
9r_1
Which particle was used in Rutherford's gold foil experiment?
Alpha particles
Beta particles
Gamma rays
Neutrons
The observation of a small number of alpha particles being deflected at large angles in Rutherford's experiment led to the discovery of:
Electrons
Protons
Neutrons
The nucleus
In Rutherford's experiment, which observation suggested that the nucleus occupies a very small volume compared to the atom?
Most alpha particles passed straight through.
Some alpha particles were deflected at small angles.
Very few alpha particles were deflected back.
The gold foil was very thin.
In Rutherford's alpha scattering experiment, a small fraction of alpha particles were deflected through large angles. This observation led to the conclusion that:
The atom is mostly empty space.
Electrons orbit the nucleus in specific energy levels.
The positive charge of the atom is concentrated in a small, dense nucleus.
Alpha particles are positively charged.
Which observation from the alpha scattering experiment suggests that the nucleus occupies a very small volume compared to the atom?
Some alpha particles are deflected through large angles.
Most alpha particles pass straight through the gold foil undeflected.
The number of scattered alpha particles decreases with increasing scattering angle.
Alpha particles are scattered in all directions.
If the distance of closest approach of an alpha particle to a nucleus is , which quantity significantly increases when the kinetic energy of the incident alpha particle is doubled?
Distance of closest approach
Speed of the alpha particle
Impact parameter
Scattering angle
In the alpha scattering experiment, the scattering angle of the alpha particles is related to which of the following?
The size of the gold foil
The number of alpha particles incident on the foil
The impact parameter
The charge of the electrons
Why was gold foil chosen for Rutherford's alpha scattering experiment?
It is a good conductor of electricity.
It has a high density.
It can be hammered into very thin sheets.
It is relatively inexpensive.
