The number of vectors of unit length perpendicular to vectors a ≡ (1, 1, 0) and b ≡ ( 0, 1, 1) is
Answer & explanation
Correct answer: option 2
The vector of unit length perpendicular to the given vectors
$=±\begin{pmatrix}\frac{a×b}{|a||b|}\end{pmatrix}$
Hence there are two such vectors.
Hence (B) is the correct answer.