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Grade: 12th pass

                        

The force between two inert gas atoms is often described by a function of the form F = 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?

2 years ago

Answers : (1)

Quanta
13 Points
							
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 
 
 
2 years ago
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