Niels Bohr — Questions and answers
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According to classical electromagnetism, what was the fundamental flaw in Ernest Rutherford's model of the atom?
Choices
- The model predicted an atom's lifespan of several seconds, not a fraction of a second.
- The nucleus was not positively charged as Rutherford had theorized.
- Electrons would continuously radiate energy and spiral into the nucleus. ✓
- Albert Einstein's remarks made the world seem incomprehensible.
Answer: Electrons would continuously radiate energy and spiral into the nucleus.
From page 2
In 1900, what revolutionary concept did Max Planck introduce regarding energy?
Choices
- Energy exists in discrete packets called 'quanta'. ✓
- Blackbody radiation proved that energy was infinitely divisible.
- The fundamental constant 'h' was an arbitrary mathematical trick.
- Energy is continuous and can be exchanged smoothly.
Answer: Energy exists in discrete packets called 'quanta'.
From page 3
What was Niels Bohr's first postulate about electrons in his atomic model?
Choices
- Electrons continuously radiate energy while in orbit.
- Electrons can only jump between orbits by absorbing a photon of any frequency.
- Electrons follow the principles of classical physics within the atom.
- Electrons exist in stable, discrete orbits without radiating energy. ✓
Answer: Electrons exist in stable, discrete orbits without radiating energy.
From page 4
What happens when an electron absorbs a photon of exact energy in Bohr's model?
Choices
- It leaps to a higher, less stable orbit, entering an 'excited state'. ✓
- It remains in its current orbit, unaffected by the photon.
- It spirals into the nucleus, causing the atom to collapse.
- It emits a photon of random energy, changing the atom's color.
Answer: It leaps to a higher, less stable orbit, entering an 'excited state'.
From page 5
What did James Franck and Gustav Hertz's 1914 experiment provide direct evidence for?
Choices
- That electrons continuously lose energy in mercury vapor.
- That atoms possess distinct, quantized energy states. ✓
- That mercury atoms absorb energy in continuous amounts.
- That classical physics accurately describes electron behavior.
Answer: That atoms possess distinct, quantized energy states.
From page 6
What philosophical framework did Niels Bohr, along with Werner Heisenberg and others, develop?
Choices
- The Simultaneous State Theory.
- The Passive Observation Principle.
- The Classical Causality Framework.
- The Copenhagen Interpretation. ✓
Answer: The Copenhagen Interpretation.
From page 7
What did Niels Bohr's concept of quantized energy levels and electron jumps pave the way for?
Choices
- The complete rejection of quantum theory.
- The re-establishment of classical physics as the dominant theory.
- Albert Einstein's theory of general relativity.
- Erwin Schrödinger's wave equation and Werner Heisenberg's matrix mechanics. ✓
Answer: Erwin Schrödinger's wave equation and Werner Heisenberg's matrix mechanics.
From page 8
What model did Niels Bohr develop with John Wheeler in 1939 to understand nuclear fission?
Choices
- The liquid drop model of the atomic nucleus. ✓
- The nuclear fluid model of the atom.
- The electron shell model.
- The macroscopic analogy model.
Answer: The liquid drop model of the atomic nucleus.
From page 9
What concept did Niels Bohr introduce to understand seemingly contradictory descriptions in quantum phenomena?
Choices
- The principle of uncertainty.
- The concept of complementarity. ✓
- The theory of classical intuition.
- The Copenhagen Interpretation of reality.
Answer: The concept of complementarity.
From page 10