Physics
Solids have definite shapes.This is because

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

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
Two waves overlap
A wave reflects upon itself

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