What are the types of diffusion and describe the two atomic mechanism.pdf

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There were 53 more nonstudents at a play than students. Student tickets were $5 and nonstudent tickets were $8. If the total revenue for the play was $1451, then how many tickets of each type were sold Solution Say x student tickets So, nonstudent tickets = x + 53 Each student ticket = 5 dollars So, x student tickets generated revenue of 5x dollars Similarly, (x + 53) nonstudent tickets generated 8(x + 53) dollars Now, Total revenue = 5x + 8(x + 53) = 1451 13x + 424 = 1451 13x = 1027 x = 79 Thus : 79 student tickets ---ANSWER 132 nonstudent tickets ---> ANSWER.

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What are the types of diffusion and describe the two atomic mechanisms of diffusion?
Solution
different types of deffusions are:
1.contagious
2.hierarchical
3.stimulus
4. relocation
the two atomic mechnisms of deffusion are:
1.vacncy diffusion mechanism:
-To jump from lattice site to lattice site, atoms need energy to break bonds with neighbors, and to
cause the necessary lattice distortions during jump.
-This energy comes from the thermal energy of atomic vibrations (Eav ~ kBT) The direction of
flow of atoms is opposite the vacancy flow direction.
2.interstitial diffusion mechanism:
-Interstitial diffusion is generally faster than vacancy diffusion because bonding of interstitials to
the surrounding atoms is normally weaker and there are many more interstitial sites than vacancy
sites to jump to.
-Requires small impurity atoms (e.g. C, H, O) to fit into interstices in host.

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