Physics
Scalar Quantities are

Physical quantities which have no magnitude and no direction
Physical quantities which have no magnitude only and only direction
Physical quantities which have magnitude only and direction
Physical quantities which have magnitude only and no direction

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Physics
Stationary wave is formed by

Two waves of the same speed superposing
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction
Two waves of same frequency travelling in the opposite direction

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