Question

Which of the following is NOT correct?

k⃗ ⋅k⃗ =1
i⃗ ×j⃗ =k⃗
i⃗ ×k⃗ =−j⃗
j⃗ ⋅j⃗ =0

Answer 1

1

Answer on question #52311, Physics, Quantum Mechanics

Question Which of the following is NOT correct?

$\vec{k} \cdot \vec{k} = 1$

$\vec{i} \times \vec{j} = \vec{k}$

$\vec{i} \times \vec{k} = -\vec{j}$

$\vec{j} \cdot \vec{j} = 0$

Solution $\vec{j} \cdot \vec{j} = 0$ is not correct.

It should be $\vec{j} \cdot \vec{j} = |\vec{j}|^2 = 1$ as it is unit vector.