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Questions and Answers
Which phenomenon can only be explained by quantum mechanics?
Which phenomenon can only be explained by quantum mechanics?
- Atomic spectral lines
- Ferromagnetism
- Electrical conductivity
- Superconductivity (correct)
What happens to the resistance of a superconductor below its critical temperature?
What happens to the resistance of a superconductor below its critical temperature?
- It remains the same
- It gradually decreases
- It abruptly drops to zero (correct)
- It increases
Who discovered the phenomenon of superconductivity?
Who discovered the phenomenon of superconductivity?
- Heike Kamerlingh Onnes (correct)
- Marie Curie
- Albert Einstein
- Niels Bohr
What is the characteristic of a superconductor in the presence of a magnetic field?
What is the characteristic of a superconductor in the presence of a magnetic field?
What is the behavior of an electric current in a loop of superconducting wire?
What is the behavior of an electric current in a loop of superconducting wire?
Which materials exhibit superconductivity?
Which materials exhibit superconductivity?
What happens to the electrical resistance of a superconductor at its critical temperature?
What happens to the electrical resistance of a superconductor at its critical temperature?
What is the Meissner effect?
What is the Meissner effect?
When was the phenomenon of superconductivity discovered?
When was the phenomenon of superconductivity discovered?
What is required to explain the phenomenon of superconductivity?
What is required to explain the phenomenon of superconductivity?
According to special relativity, the laws of physics are invariant in frames of reference with no acceleration. What is the second postulate of special relativity?
According to special relativity, the laws of physics are invariant in frames of reference with no acceleration. What is the second postulate of special relativity?
What led to the development of the Lorentz transformations in special relativity?
What led to the development of the Lorentz transformations in special relativity?
What did Albert Einstein's 1905 paper on the electrodynamics of moving bodies describe?
What did Albert Einstein's 1905 paper on the electrodynamics of moving bodies describe?
What is the special theory of relativity also known as?
What is the special theory of relativity also known as?
What did the Michelson-Morley experiment fail to detect?
What did the Michelson-Morley experiment fail to detect?
According to Albert Einstein's 1905 paper, what is the basis of the special theory of relativity?
According to Albert Einstein's 1905 paper, what is the basis of the special theory of relativity?
What is the second postulate of special relativity?
What is the second postulate of special relativity?
What did the Michelson-Morley experiment fail to detect?
What did the Michelson-Morley experiment fail to detect?
What led to the development of the Lorentz transformations in special relativity?
What led to the development of the Lorentz transformations in special relativity?
What did Albert Einstein's 1905 paper on the electrodynamics of moving bodies describe?
What did Albert Einstein's 1905 paper on the electrodynamics of moving bodies describe?
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Study Notes
Superconductivity
- Only explained by quantum mechanics
- Below critical temperature, resistance of superconductor becomes zero
- Discovered by Heike Kamerlingh Onnes in 1911
- In presence of magnetic field, superconductor expels magnetic field (Meissner effect)
- Electric current in loop of superconducting wire persists indefinitely with no reduction
Materials
- Certain materials exhibit superconductivity
- Examples not specified
Critical Temperature
- At critical temperature, electrical resistance of superconductor becomes zero
Meissner Effect
- Expulsion of magnetic field by superconductor in presence of magnetic field
History
- Superconductivity discovered in 1911 by Heike Kamerlingh Onnes
Theory
- Quantum mechanics required to explain phenomenon of superconductivity
Special Relativity
Postulates
- Second postulate: the laws of physics are invariant in frames of reference with no acceleration
Development
- Led to development of Lorentz transformations
- Albert Einstein's 1905 paper on electrodynamics of moving bodies described special theory of relativity
Theory
- Also known as the special theory of relativity
- Basis: the laws of physics are the same for all observers in uniform motion relative to one another
Experiments
- Michelson-Morley experiment failed to detect ether wind
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