Answer
$\dfrac{1}{3}\log_2 y$
Work Step by Step
Using $\log_b x^a=a\log_b x$ (or the logarithm of a power), the given logarithmic equation, $
\log_2 y^{1/3}
,$ is equivalent to
\begin{array}{l}\require{cancel}
\dfrac{1}{3}\log_2 y
.\end{array}