The figure above shows the interatomic force (F) vs. seperation (r) for two diff
ID: 3163502 • Letter: T
Question
The figure above shows the interatomic force (F) vs. seperation (r) for two different materials.
a) What is r0? Explain.
b) Is the interatomic force (F) attractive or repulsive? Why?
c) Draw the corresponding (schematic) energy (E) vs. separation (r) and identify the quantity "bonding energy".
d) Compare the properties of the two materials based on the differences you observe in their interatomic forces. Consider stiffness, tensile strength, and coefficient of thermal expansion.
e) Specimens made of these two materials are subjected to tensile forces. Which breaks easier? Explain.
f) Which has the greater melting point?
g) Which has greater interatomic spacing?
Interatomic Separation r Interatomic Separation r ot ra ep ne O (3) 80Oj alonediajul in ot ta ar ra ep ne (d) a 104 alo!uedenulExplanation / Answer
a) r0 is the bond length, at this point the attractive force between the atoms is equal to the repulsive force between the atoms.
b) Interatomic forces are repulsive if the distance between them is less than r0 and attractive if the distance between them is more than r0.
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