Calculation: 8mMdHt - 1

v  = 
 
 e^2
/ ( 4* π* ε0* n* )
v =  
 e^2
/ ( 4* π* ε0* n* )
$$v$$ = $$\frac{e^{2}}{4\cdot \pi\cdot \varepsilon0\cdot n\cdot \hbar}$$
v =  
 e^2
/ 4/ n/ ε0/ π/ 
$$v$$ = $$\frac{e^{2}}{4\cdot n\cdot \varepsilon0\cdot \pi\cdot \hbar}$$
v =  
 0.25* e^2
/ n/ ε0/ π/ 
$$v$$ = $$\frac{0.25\cdot e^{2}}{n\cdot \varepsilon0\cdot \pi\cdot \hbar}$$