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The force between two inert gas atoms is often described by a function of the formF = Ar−^13 −Br−^7 where A and B are positive constants and r is the distance between the atoms. Answer in terms of A and B. (a) What is the equilibrium separation?(b) What is the work done if the atoms are moved from their equilibrium separation to a very large distance apart?

Momin Imtiaz , 7 Years ago
Grade 12th pass
anser 1 Answers
Quanta

Last Activity: 7 Years ago

at equilibrium sum of all forces is zero ,this means Ar^-13-Br-7=0
now solve this for r
for the work done ,since the force is a function of r (ie it is a varing force ),so use the following equation
 w=\int_{R}^{r}F.drcos\mathbb{\theta } here angle between force and dr s 180 ,r is the initial distance and R is the final maximum distance...after integration you would get 
 
 

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