Elementary Particles: Which of the following particles are leptons? (There may be more than one correct choice.)
A. protons
B. neutrons
C. electrons
D. photons
E. quarks
Answer: C
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Consider a system consisting of two Einstein solids P and Q in thermal contact. Assume that we know the number of atoms in each solid and ?. What do we know about the system if we also know the quantum state of each atom in each solid?
A. Its macrostate B. Its microstate C. Its macropartition D. Its microstate and macropartition E. Its macrostate and macropartition F. Its macrostate and microstate T. Its macrostate, microstate, and macropartition
A proton and an electron are both accelerated to the same final speed. If ?p is the de Broglie wavelength of the proton and ?e is the de Broglie wavelength of the electron, then
A) ?p = ?e. B) ?p > ?e. C) ?p < ?e.
According to the hypothesis of de Broglie, any moving particle has
a. energy. b. a magnetic force field. c. an electric force field. d. a wavelength.
When the voltage across a resistor is decreased by 50%, what happens to the power dissipated?
A. it increases by 50% B. it decreases by 50% C. it decreases by 25% D. it decreases by 71% E. it decreases by 75%