Diamond is FCC with a lattice parameter of 0.357 nm and atoms located at 0,0,0 and at 1/4,1/4,1/4, and these two atoms are nearest neighbors. Calculate the atomic radius of a carbon atom in diamond, assuming that the radii touch between nearest neighbors.
What will be an ideal response?
The atomic diameter (2R) is equal to the distance between the two atoms at 0,0,0 and ¼,¼, ¼ and this distance (2R) is equal to ¼ of the distance along the body diagonal of the cubic unit cell. The body diagonal is thus equal to 8R.
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Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size. B) be moving away from us, with more distant ones moving faster. C) be made mostly of dark matter. D) rotate rapidly.
All neutron stars must begin as millisecond pulsars just after their supernova creation
Indicate whether the statement is true or false
Star A has the peak of its blackbody radiation at lA. Star B has its peak at lB, which is one-third that of lA. If Star A's surface temperature is TA, how does the surface temperature TB of Star B compare?
a. TB = TA/9 c. TB = 9 TA b. TB = 3 TA d. TB = TA/3
During the peak of a total annular eclipse, the image of the Sun cast onto some white paper is
A) a circle. B) a crescent. C) a large white spot. D) not going to be seen.