For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200)
(b) (110)
(c) (130)
(d) (111)
(d) (111)
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Beyond the formation of iron, nuclear energy can be produced only by:
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.
How does seafloor crust differ from continental crust?
A) Seafloor crust is thinner, older, and lower in density. B) Seafloor crust is thinner, younger, and higher in density. C) Seafloor crust is thicker, older, and higher in density. D) Seafloor crust is thicker, younger, and lower in density.
The RR Lyrae stars all have periods of
A) less than a second. B) several minutes. C) several hours. D) several days. E) several weeks.
A beam of electrons is accelerated through a potential difference of 10 kV before entering a velocity selector
If the B-field of the velocity selector has a value of 0.010 T, what value of the E-field is required if the particles are to be undeflected? A) 2.3 × 103 V/m B) 7.9 × 103 V/m C) 5.9 × 105 V/m D) 6.0 × 105 V/m E) 7.2 × 106 V/m