Which of the following is true about Bragg planes?
d.
Bragg planes must be evenly spaced to create the interference pattern characteristic of the planes.
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As a rock sinks deeper and deeper into water of constant density, what happens to the buoyant force on it?
A) It increases. B) It remains constant. C) It decreases. D) It may increase or decrease, depending on the shape of the rock. E) It may increase or decrease, depending on the weight of the rock.
For a BCC crystal, which of the following x-ray (hkl) diffraction peaks is not present?
(a) (200) (b) (110) (c) (130) (d) (111)
Based on the curves shown here, which of the following statements best describes how we can distinguish a massive star supernova from a white dwarf supernova?
A) A white dwarf supernova is brighter at its peak and over a few months fades more steadily than a massive star supernova. B) For a few seconds, a white dwarf supernova is brighter than a massive star supernova, but after that the two look virtually identical. C) The spectrum of a massive star supernova has two major spectral lines, while a white dwarf supernova has only one. D) The two types of supernovae behave so similarly that we can only distinguish them by studying photographs of the systems taken before the explosions.
Alternating current is normally produced by a
A) battery. B) generator. C) both of these D) neither of these