Alpha-Particle Scattering Experiment NEET Questions

Physics - Atoms and Nuclei

Alpha-Particle Scattering Experiment MCQ Questions


7.
Approximately what fraction of alpha-particles scattered by more than 90° in the Geiger-Marsden experiment?
A.
1 in 80
B.
1 in 800
C.
1 in 80000
D.
1 in 8000
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ANSWER :
D. 1 in 8000
8.
The collimation of alpha-particles into a narrow beam in the Geiger-Marsden experiment was achieved by:
A.
Lead bricks
B.
Magnetic field
C.
Electric field
D.
Glass plates
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ANSWER :
A. Lead bricks
9.
What percentage of incident alpha-particles scattered by more than 1° in the Geiger-Marsden experiment?
A.
About 14%
B.
About 1.4%
C.
About 0.014%
D.
About 0.14%
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ANSWER :
D. About 0.14%
10.
The fact that most alpha-particles passed straight through the gold foil in the Geiger-Marsden experiment indicates that:
A.
Atoms are solid spheres
B.
Most of the atom is empty space
C.
Atoms are negatively charged
D.
Alpha-particles have very low energy
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ANSWER :
B. Most of the atom is empty space
11.
The backward scattering of a small fraction of alpha-particles led Rutherford to conclude that:
A.
Alpha-particles are very heavy
B.
Atoms have a uniform distribution of mass
C.
Electrons are at the centre of the atom
D.
Most of the mass and positive charge of the atom is concentrated at the centre
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ANSWER :
D. Most of the mass and positive charge of the atom is concentrated at the centre
12.
The size of the nucleus, as estimated from Rutherford's scattering experiment, is approximately:
A.
10⁻¹⁵ m to 10⁻¹⁴ m
B.
10⁻¹⁰ m to 10⁻⁹ m
C.
10⁻²⁰ m to 10⁻¹⁹ m
D.
10⁻⁵ m to 10⁻⁴ m
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ANSWER :
A. 10⁻¹⁵ m to 10⁻¹⁴ m