Physics
Stationary wave is formed by

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

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large
The forces of cohesion are very large

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