Physics
The Hooke's law is valid for

Entire elastic region of the stress strain curve
Entire stress strain curve
Elastic as well as plastic region of the stress strain curve
Only proportional region of the stress strain curve

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Physics
Stationary wave is formed by

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

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