Atomic Theory Quiz

Who is known for the discovery of the neutron?

• J. J. Thomson

• Niels Bohr

• James Chadwick

• Ernest Rutherford

Which philosopher is known for the early concept of the atom as indivisible?

• Democritus

• Ernest Rutherford

• James Chadwick

• Niels Bohr

Which scientist's model was replaced by the nuclear model of the atom?

• J. J. Thomson

• Niels Bohr

• James Chadwick

• Democritus

What component in the cathode ray tube is responsible for heating?

• Anode

• Cathode

• Heater

• Electrode

What is the primary question addressed by the cathode ray tube experiment?

• What is the speed of light?

• What is the structure of the atom?

• How do magnets work?

• What is the nature of sound?

What is observed about alpha particles when they interact with a material?

• They all pass through without any deflection.

• Some of them are deflected by large angles.

• They are absorbed completely.

• They emit light.

What happens to a few alpha particles when they encounter a material?

• They pass through in straight ways.

• They are deflected by small angles.

• They are absorbed.

• They bounce back at angles greater than 90°.

Can the results of the alpha particle experiment be explained with the plum-pudding model?

• Yes, because charges and masses are evenly distributed.

• No, because alpha particles will not deflect by large angles.

• Yes, because alpha particles are absorbed.

• No, because alpha particles pass through without deflection.

What is the size of the nucleus compared to the atom?

• Very large

• Very small

• Equal

• Larger than the atom

Where is most of the mass and positive charge concentrated in an atom?

• Electrons

• Neutrons

• Nucleus

• Protons