In a colliding-beam experiment, protons moving at 0.800 c in opposite directions strike one another. What is the speed of the incoming proton as viewed by the proton about to be hit?
A. 1.60 c
B. 0.00
C. 0.640 c
D. 0.976 c
E. 0.960 c
D. 0.976 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?
__________is a graph of orbital velocity versus radius in the disk of a galaxy
A) A rotation curve B) A normal distribution C) The H-R diagram D) The light curve
____ pushed gas and dust particles out of the solar nebula by the light from the sun
a. Radiation pressure b. Outgassing c. Condensation d. Accretion e. Differentiation
The person who expounded the uncertainty principle was
a. Max Planck b. Albert Einstein c. Neils Bohr d. Erwin Schroedinger e. Werner Heisenberg.