Ex8 1

$\def\abs#1{|#1|}\def\i{\mathbf {i}}\def\ket#1{|{#1}\rangle}\def\bra#1{\langle{#1}|}\def\braket#1#2{\langle{#1}|{#2}\rangle}\mathbf{Exercise\ 8.1}$

Give the exact value of the scale factor $C$ in equation 8.2 in terms of properties of $f$ and $u$.