The transitions of an electron in the hydrogen atom to the n = 2 level result in the
a. Lyman series.
b. Balmer series.
c. Paschen series.
d. Bohr series.
b
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The most accurate way of finding the distance to some very far away stars might be by observing
A. the rate of variation in their luminosity. B. their motion relative to nearby stars. C. their orbiting planets. D. the variation in their position in the night sky on successive nights.
A 1.0-mol sample of an isotope is decaying with a half-life of 28 y. After 61 y, how many moles of this isotope are left and what is its activity in Bq?
What will be an ideal response?
A reasonable estimate for the mass of an ordinary passenger car is
A) 100 kg B) 1000 kg C) 5000 kg D) 10,000 kg
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?