Bond Strength and Force constant

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SUMMARY

The discussion centers on calculating bond strength and the force constant using the total energy equation, \(E=\frac{-e^2}{4\pi\epsilon_{0}R}-\frac{B}{R^{5/6}}\). The derivative of energy with respect to \(R\) is set to zero at \(R=R_0\), leading to the expression \(B=\frac{3e^2}{10\pi\epsilon_{0}{R_{0}}^{1/6}}\). Participants highlight the need to clarify the signs in the energy expression and emphasize the importance of understanding bond energy and spring constant definitions for further calculations.

PREREQUISITES
  • Understanding of potential energy equations in physics
  • Familiarity with derivatives and their applications in optimization
  • Knowledge of bond energy and spring constant concepts
  • Basic principles of electrostatics, particularly Coulomb's law
NEXT STEPS
  • Research the definitions and calculations of bond energy in molecular physics
  • Study the derivation and implications of the spring constant in Hooke's Law
  • Explore advanced topics in electrostatics, focusing on energy interactions
  • Learn about the implications of negative values in energy equations and their physical significance
USEFUL FOR

Students in physics or chemistry, particularly those studying molecular interactions, bond strength, and energy calculations. This discussion is beneficial for anyone tackling problems related to potential energy and force constants in a homework or research context.

Muthumanimaran
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Homework Statement


3.png


Homework Equations

The Attempt at a Solution


(a) Total energy is
$$E=\frac{-e^2}{4\pi\epsilon_{0}R}-\frac{B}{R^{5/6}}$$

Taking derivative of E with respect to R and equating it to zero when R=R0 yields,
i.e,
$$\frac{dE}{dR}{\bigg|}_{R=R_0}=0$$
when R=R0
yields,
$$B=\frac{3e^2}{10\pi\epsilon_{0}{R_{0}}^{1/6}}$$

How to proceed with part (b) and part (c)? giving me hints to solve this problem is highly helpful.
 

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There seems to be a problem with the signs. Doesn't your energy expression lead to a negative value for B?
 
You haven't finished part a yet. The question asks you to calculate a value.
For b and c, What is the definition of bond energy? What is the definition of spring constant? If you don't know equations for finding these, can you work them out by thinking logically about the situation?
 

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