Determine the magnitude of the Burger’s vector in MgO, shown in Figure 3.10, that has the NaCl crystal structure with a lattice parameter of 0.4212 nm, and compare the magnitude of this Burger’s vector to that of copper. Note that the Burger’s vector is in the [110] direction in MgO.
What will be an ideal response?
As shown in Figure 3.10 the Burger’s vector is between lattice points in the [110] direction. In the MgO (NaCl) structure there are lattice points at the face centered cubic positions. Thus the Burgers vector goes from 0, 0, 0 to ½, ½, 0. That distance in the in MgO is equal to
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A radiating body originally has a Kelvin temperature To, and its surroundings are at 500K (To > 500K). If the Kelvin temperature of the radiating body is increased to 3To,
the net rate at which the body radiates increases by a factor of 333. What was the original temperature To?
Using Table 11.3, which of the following materials would you conclude have the greatest thermal conductivities?
1.metals
2.gases
3.nonmetals
4.gases and nonmetals
A charge of 5.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of -2.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 3.0 cm from the center of the two surfaces
a. 30 N/C b. 50 N/C c. 40 N/C d. 20 N/C e. 70 N/C
During which of the following processes is latent heat released?
What will be an ideal response?