DDR for Particle Physics AS

In the alpha-particle scattering experiment, what did most of the alpha-particles do when they were fired at the gold foil?

• They bounced back.

• They were absorbed by the gold foil.

• They went straight through.

• They split into smaller particles.

What happened to a very small proportion of the alpha-particles that were fired at the gold nucleus?

• They went straight through.

• They bounced back.

• They were absorbed by the nucleus.

• They disintegrated.

State the conclusions about the nature of the atom that were inferred from the alpha-particle scattering experiment. Which of the following is NOT a correct conclusion?

• Most of the atom is empty space.

• Most of the atom's mass is concentrated in a small nucleus.

• The nucleus is negatively charged.

• The nucleus is positively charged.

Which of the following represents the nucleon number?

• The number of protons.

• The number of neutrons.

• The number of protons and neutrons combined.

• The atomic number.

What is the proton number?

• The number of neutrons in the nucleus.

• The number of protons in the nucleus.

• The sum of protons and neutrons.

• The charge of the atom.

• 36 protons, 90 neutrons

• 54 protons, 36 neutrons

• 36 protons, 54 neutrons

• 54 protons, 90 neutrons

What is an isotope?

• Atoms with the same number of neutrons but different numbers of protons.

• Atoms with the same number of protons but different numbers of neutrons.

• Atoms with different numbers of protons and neutrons.

• Atoms with the same number of neutrons but different numbers of electrons.

Which physical quantities are conserved in a nuclear process?

• Mass and energy

• Nucleon number and charge

• Charge and volume

• Energy and charge

An alpha-particle consists of:

• 2 protons and 2 electrons

• 1 proton and 1 neutron

• 2 protons and 2 neutrons

• 2 neutrons and 2 electrons

What is a beta minus particle?

• A proton, positively charged

• A neutron, neutrally charged

• An electron, negatively charged

• A photon, neutral