Physics
The sky appears blue because

All colours interfere to produce blue
The atmosphere scatters blue colour more than the others
In white light, the blue component dominates
It is actually blue

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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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