Consider the atomic jump. An atom next to a vacancy can make a jump provided it has enough thermal energy to overcome the activation energy barrier to migration. However, most of the time the adjacent site will not be vacant and the jump will not be possible. The probability that an adjacent site is vacant is given by_________. (X is the probability that any one site is vacant, z is the number of nearest neighbours)

Consider the atomic jump. An atom next to a vacancy can make a jump pr

1.	Consider the atomic jump. An atom next to a vacancy can make a jump provided it has enough thermal energy to overcome the activation energy barrier to migration. However, most of the time the adjacent site will not be vacant and the jump will not be possible. The probability that an adjacent site is vacant is given by_________. (X is the probability that any one site is vacant, z is the number of nearest neighbours)
A.	X*z
B.	X/z
C.	X+z
D.	X-z
Answer» B. X/z