The discreteness of orbits of electrons in an atom are due to
A) wave interference.
B) momentum conservation.
C) electric charge quanta
D) all the above
E) none of the above
Answer: A
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Fred swings a sheet of copper in pendulum fashion between the poles of a strong magnet. The sheet slows in entering the magnetic field because it
A) induces swirling currents in the copper and accompanying magnetic fields that resist motion. B) experiences both air and magnetic friction. C) is repelled by free electrons in the copper. D) none of the above
A copper cylinder with a mass of 125 g and temperature of 345°C is cooled by dropping it into a glass beaker containing 565 g of water initially at 20.0°C
The mass of the beaker is 50.0 g and the specific heat of the glass is 840 J/kg?K. What is the final equilibrium temperature of the system, assuming the cooling takes place very quickly, so that no energy is lost to the air? The specific heat of copper is 385 J/kg?K and that of water is 4190 J/kg?K.
Adding a few impurity atoms, like arsenic or gallium, to a semiconductor can produce
A. abundant thermal inversion. B. a significant increase in mass, even though the impurity atoms are quite sparse. C. gravitational repulsion of the impurity atoms, like the expanding universe. D. useful changes in the conductivity.