Mathematics

Problem

18. If

\vec{a}

is a nonzero vector of magnitude '

a

' and

\lambda

a nonzero scalar, then

\lambda \vec{a}

is unit vector if (A)

\lambda=1

(B)

\lambda=-1

(C)

a=|\lambda|

(D)

a=1 /|\lambda|

(A)

\lambda=1

(B)

\lambda=-1

(C)

a=|\lambda|

(D)

a=1 /|\lambda|