Podcast
Questions and Answers
What did James Chadwick provide evidence for, 20 years after the 'nucleus' was accepted as a scientific idea?
What did James Chadwick provide evidence for, 20 years after the 'nucleus' was accepted as a scientific idea?
- Existence of protons
- Existence of positrons
- Existence of electrons
- Existence of neutrons (correct)
In radioactive decay, what is defined as the rate at which a source of unstable nuclei decays?
In radioactive decay, what is defined as the rate at which a source of unstable nuclei decays?
- Alpha decay
- Activity (correct)
- Count-rate
- Beta decay
Which type of radiation is highly ionizing and weakly penetrating?
Which type of radiation is highly ionizing and weakly penetrating?
- Beta Minus β (electron)
- Neutron
- Alpha α (helium nucleus) (correct)
- Proton
What is the unit used to measure the count-rate of decays recorded by a detector per second?
What is the unit used to measure the count-rate of decays recorded by a detector per second?
What is the name for the random process by which atomic nuclei undergo radioactive decay to become more stable?
What is the name for the random process by which atomic nuclei undergo radioactive decay to become more stable?
Which scientist's experiment led to the discovery that electrons exist in fixed 'orbitals' within an atom?
Which scientist's experiment led to the discovery that electrons exist in fixed 'orbitals' within an atom?
According to the Rutherford model, what did the results of the gold foil experiment suggest about the structure of an atom?
According to the Rutherford model, what did the results of the gold foil experiment suggest about the structure of an atom?
Which model of the atom proposed that electrons orbit the nucleus in specific energy levels or shells?
Which model of the atom proposed that electrons orbit the nucleus in specific energy levels or shells?
What is the primary difference between the Rutherford model and the Bohr model of the atom?
What is the primary difference between the Rutherford model and the Bohr model of the atom?
What is the primary limitation of the Bohr model of the atom?
What is the primary limitation of the Bohr model of the atom?
Which subatomic particle was discovered during the gold foil experiment conducted by Rutherford?
Which subatomic particle was discovered during the gold foil experiment conducted by Rutherford?
What is the primary difference between the concepts of contamination and irradiation in the context of radioactivity?
What is the primary difference between the concepts of contamination and irradiation in the context of radioactivity?
What was the main conclusion of the Rutherford Gold Foil Experiment?
What was the main conclusion of the Rutherford Gold Foil Experiment?
According to the Bohr model of the atom, why did the electrons not collapse into the nucleus?
According to the Bohr model of the atom, why did the electrons not collapse into the nucleus?
What was the key difference between the Rutherford model and the Bohr model of the atom?
What was the key difference between the Rutherford model and the Bohr model of the atom?
What was the primary reason the Plum Pudding model of the atom was abandoned?
What was the primary reason the Plum Pudding model of the atom was abandoned?
What was the significance of the few alpha particles that were deflected by more than 90 degrees in the Rutherford Gold Foil Experiment?
What was the significance of the few alpha particles that were deflected by more than 90 degrees in the Rutherford Gold Foil Experiment?
