Consider the high temperature diffusion of arsenic at 1619°c for 290 hours into a semi-infinite solid cylinder of pure silicon having a radius r=810 e-6 m. assume values of do = 0.218 cm2/s, q = 332.2 kj/mole, r = 8.314 j/mole-k and a surface concentration 6e18 atoms/cm3. determine the concentration at the ten (10) equally spaced distances from the surface listed below.
a)cx(@x0=0.0? r) = cx0= b)cx(@x1=0.1? r) = cx1= c)-cx(@x2=0.2? r) = cx2=
d)-cx(@x3=0.3? r) = cx3= e)cx(@x4=0.4? r) = cx4= f)-cx(@x5=0.5? r) = cx5=
g)-cx(@x6=0.6? r) = cx6= h)-cx(@x7=0.7? r) = cx7= i)-cx(@x8=0.8? r) = cx8=
j)-cx(@x9=0.9? r) = cx9= k)-cx(@x10=1.0? r) = cx10=

When temperature of a substance increases, of its particles increase resulting in more between particles. real world applications of thermal expansion absolute zero (-273 degrees c) is the lowest possible temperature on the kelvin scale. it is a measure of where a substance has no kinetic energy. heat is a process of the . energy flows spontaneously from a object to a until equilibrium is reached. heat is measured in heat is transferred throughis a method of heat transfer that occurs between particles of matter that are in direct contact with each other. are poor conductors that impede / reduce the rate of heat transfer. is a method of heat transfer that occurs in fluids (non-solids) by means of currents. real world application of convectiona method of heat transfer through electromagnetic waves. when energy moves from one object to another inside a closed system, no energy is or in the system in the transaction. systems will spontaneously move to a state of organized energy or high disorder over time called

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

Which of these is the best way to manage a natural resource