Consider an atom of carbon in which the nucleus contains 6 protons and 7 neutrons. What is its atomic number and atomic mass number?
A) atomic number = 13; atomic mass number = 6 B) atomic number = 6; atomic mass number = 7
C) atomic number = 6; atomic mass number = 13 D) atomic number = 7; atomic mass number = 13
C
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A copper-nickel alloy is used in a heat exchanger for a power plant that uses ocean water for cooling. One way to check the consistency of the alloy’s composition across batches of material is to determine the lattice parameter of the alloy. We know that copper and nickel are both FCC crystals and that copper and nickel form a limited-solid solution, and also that the lattice parameter of the alloy depends upon the composition. To determine the lattice parameter of the alloy, the angles of the diffraction peaks from a polycrystalline piece of the alloy are measured in an x-ray diffractometer with a cobalt x-ray tube. Cobalt is used because the cobalt K? radiation is of a lower energy than is the absorption edge in either copper or nickel, and no characteristic x-rays will be generated
in the copper and nickel. Also, the copper and nickel should be relatively transparent to the cobalt K? radiation. With the cobalt K? radiation, the lowest angle intense peak is measured at 25.74°. The lattice parameter of copper is 0.361 nm and for nickel it is 0.352 nm, and the wavelength of cobalt K? radiation is 0.1790 nm. (a) What are the Miller indices of this peak, and what is the lattice parameter of this copper-nickel mixture? (b) Assuming that the lattice parameter varies linearly with composition in this alloy, what is the percent of nickel and copper?
Simple Pendulum: Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs slow. Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.)
A. Raise the weight. B. Lower the weight. C. Add more mass to the weight. D. Remove some mass from the weight. E. Increase the amplitude of swing by a small amount.
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
A. 0.0227 s. B. 0.377 s. C. 2.26 s. D. 105 s. E. 1750 s.
An elevator weighing 10,000. N is supported by a steel cable. Determine the tension in the cable when the elevator is accelerated upward at 3.0 m/s2. (g = 9.8 m/s2)
A) 40. kN B) 10. kN C) 7.0 kN D) 13. kN E) 11. kN