The first quarter Moon rises about noon today; what will its phase be, and when will it rise tomorrow?
What will be an ideal response?
It will be waxing gibbous, and rise about 1 PM by the next day.
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If sufficient force is applied to a crystal, it can be permanently deformed. Permanent deformation in metal crystals occurs due to atomic displacements on the planes that are most closely packed, and it happens in the most closely packed directions. Assume that a force is applied to a crystal of FCC copper that permanently stretches the crystal in the [001] direction. The (111) plane is one of the close-packed planes in FCC copper on which permanent deformation could occur.
(a) What is the angle between the [001] direction and the normal to the (111) plane? (b) Atom displacements along which close-packed directions within the (111) plane could contribute to the permanent deformation of the crystal in the [001] direction?
Assuming the impact hypothesis is correct, in what way(s) was the impact important to our existence on Earth today?
A. Water from the impact-generated tsunami explains why regions of North America are agriculturally fertile today. B. The iridium and other metals brought to Earth by the impact have proven to be very important for modern electronic devices. C. Prior to the impact, early humans had been threatened by dinosaurs, but after the impact they were free to develop civlization. D. It seems unlike that we would have evolved by now without the extinctions caused by the impact.
Uranium-238 decays to Thorium-234 by emitting which of the following?
a. beta b. alpha c. gamma d. positron
An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?
A) 15 B) 98 C) 6 D) 7 E) 33