If a unit vector is represented by $0.5 \hat{i}-0.8 \hat{j}+c \hat{k}$ then the value of $c$ is\

Question

Professor PC Thomas Classes · Answer

(b) : For a unit vector $\hat{n},|\hat{n}|=1$\ $|0.5 \hat{i}-0.8 \hat{j}+c \hat{k}|^{2}=1^{2} \Rightarrow 0.25+0.64+c^{2}=1 \quad$ or $c=\sqrt{0.11}$\