513.001 Molecular and Solid State Physics

Return to
problem list

Physical
Constants

Google
Calculator

Wolfram
Alpha

      

Ionic crystal

(a) Determine the Madelung constant for NaCl including only the nearest neighbors and the next nearest neighbors in the sum.

(b) The cohesive energy of NaCl can be described by the function,

Here R is the interatomic spacing and z is the number of nearest neighbors. λ,ρ and α are constants. How could you determine the density of NaCl from this expression?