Mathematics

Problem

Two non-zero vectors

\mathbf{u}

and

\mathbf{v}

satisfy

\mathbf{u}\cdot\mathbf{v}=0

. Which statement must be true? a)

\mathbf{u}\times\mathbf{v}=\mathbf{0}

\mathbf{u}

is perpendicular to

\mathbf{v}

|\mathbf{u}| = |\mathbf{v}|

\mathbf{u}

is parallel to

\mathbf{v}