Show that vector a = (vector i - vector j)/√2 is a unit vector.
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Explanation ⇒ To prove that,
is an unit vector. means its magnitude is 1.
Okay. For magnitude, first separate x term and y terms.
Thus, i/√2 - j/√2 = t (let)
∴ |t|² = (1/√2)² + (-1/√2)²
∴ |t|² = 1/2 + 1/2
∴ |t|² = 1
∴ |t| = 1 [Mod cannot be -ive.]
Hence Proved that given expression is the unit vector having magnitude 1.
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