Elementary Modern Physics — Bohr's Theory
Physics · 50 practice questions
Models of the atom and their limitations; elementary structure of the atom; energy levels and spectra; thermionic and photoelectric emissions; Einstein's equation and stopping potential; production of X-rays; properties and applications of alpha, beta and gamma rays; half-life and decay constant; nuclear fusion and fission; binding energy, mass defect and Einstein's energy equation (ΔE = Δmc²); wave-particle duality; electron diffraction; the uncertainty principle.
- Identify models of the atom and their limitations, and describe the elementary structure of the atom.
- Differentiate between energy levels/spectra and compare thermionic and photoelectric emission.
- Apply Einstein's equation to solve photoelectric-effect problems and calculate stopping potential.
- Identify properties of X-rays, alpha, beta and gamma rays.
- Relate half-life and decay constant, and determine binding energy, mass defect and Einstein's energy equation.
- Analyse wave-particle duality and solve problems on the uncertainty principle.
Try a few questions
- Practice question 1
Nuclear fission is the splitting of a large, unstable nucleus into
- A.a single, larger and more stable nucleus, with no energy released
- B.two smaller nuclei, usually accompanied by the release of a large amount of energy
- C.pure energy alone, with no remaining nuclear material at all
- D.an identical copy of the original nucleus, with no change at all
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B. two smaller nuclei, usually accompanied by the release of a large amount of energy
This splitting process, releasing substantial energy along with the resulting smaller nuclei, defines nuclear fission.
- Practice question 2
Radiation safety measures, such as shielding, limiting exposure time, and maintaining distance from a source, are all used to
- A.maximize the biological harm caused by ionizing radiation
- B.minimize the biological harm caused by ionizing radiation
- C.generate additional radioactive material for research purposes
- D.permanently disable a radioactive source entirely
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B. minimize the biological harm caused by ionizing radiation
These standard precautions are specifically designed to reduce a person's exposure to harmful ionizing radiation.
- Practice question 3
A chain reaction in nuclear fission occurs when the neutrons released from one fission event
- A.are completely absorbed with no further effect on nearby nuclei
- B.convert directly into protons, with no further fission triggered
- C.go on to trigger further fission events in neighbouring nuclei
- D.escape the reactor entirely, with no further fission occurring
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C. go on to trigger further fission events in neighbouring nuclei
This self-sustaining sequence, where each fission event triggers further fissions, defines a nuclear chain reaction.
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