Question: Using Scientific Constants

I'm trying to use the scientific constants package to evaluate the product of certain constants. 

What I'm trying to calculate is the value

(mu*e^(4)/(2*hbar^2), where mu is the reduced mass of the electron and proton, and hbar is Plancks's Constant divided by 2*Pi.

This is for a Quantum Mechanics problem where I'm supposed to show for the large quantum number limit, i.e. large n, this angular frequency approaches values for the classical angular frequency of an ordinary rotating object.

I can get a numerical value for this quantity using the evalf command, but I'm having trouble getting the units of this product of constants with the GetUnit command.

I'm calling the product of these constants A in the worksheet.

Can anyone help me get the units for this product?

thanks,

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