Question

If the unit vectors $\vec{a}$ and $\vec{b}$ are inclined at an angle 2θ such that $|\vec{a}-\vec{b}|\lt 1$ and $0 \leq \theta \leq \pi$, then θ lies in the interval.

• A. [0, π/2]
• B. [5π/6,π]
• C. [π/6,π/2]
• D. [π/2,5π/6]

Answer 1

Answer: (B)

[5π/6,π]

Answer 2

The correct answer is(B): [5π/6,π]